Can I Have Sex During IVF in Hong Kong? - Risks & Medical Advice for Each Stage (Stimulation, Egg Retrieval, Transfer)

Opening: A Real Consultation Scenario

"Dr. Wang, I'm going to Hong Kong next week to start my cycle. I want to ask clearly, can we still have normal marital relations during this period? I'm afraid it will affect the treatment, but I'm also afraid of hurting our relationship." This is a question I encounter almost every week in the clinic. The patient speaking was in her early thirties, doing IVF for the first time, clutching a stack of test reports, her eyes filled with both hope and anxiety.

This question seems simple, but it truly concerns treatment safety and the marital relationship. As a reproductive doctor, my answer is never just a simple "yes" or "no." It requires a detailed assessment based on the different stages of IVF treatment and the patient's individual situation. Let me break down this topic clearly below.

Can you have sex during IVF? Explained by stage.

The entire IVF treatment process lasts about 4-6 weeks. The ovarian state, uterine environment, and hormone levels vary greatly at different stages, and the risk level of intercourse is completely different. I have organized the answers according to the treatment timeline into the table below for your easy reference.

Why is intercourse restricted by stage during IVF?

To understand the medical logic behind this, you first need to know what changes occur in the body after ovarian stimulation. In a natural cycle, only one follicle develops per month. However, IVF stimulation uses exogenous hormones (FSH, HMG, etc.) to allow multiple follicles to develop simultaneously. Consequently, the ovarian volume increases significantly in a short period – a normal ovary is about 3-4 cm, but during mid-to-late stimulation, it can reach 6-8 cm or even larger.

Intercourse primarily introduces four types of risks:

• Ovarian Torsion: The enlarged ovary has increased mobility. Changes in position or abdominal impact during intercourse can cause ovarian torsion, presenting as sudden lower abdominal pain, nausea, and vomiting. Severe cases may require surgical detorsion or even removal of the ovary.
• Premature Ovulation: Sexual arousal may induce fluctuations in LH levels, causing premature release of eggs, resulting in no eggs to retrieve on retrieval day and cycle cancellation.
• Infection: Egg retrieval surgery involves transvaginal needle aspiration of follicles, leaving micro-wounds on the vaginal wall and ovarian surface. Intercourse post-surgery can introduce vaginal bacteria into the uterine cavity and pelvis, causing endometritis, pelvic inflammatory disease, or even ovarian abscess.
• Uterine Contractions Disrupting Implantation: During orgasm, oxytocin release increases, causing rhythmic uterine contractions. In fresh transfer cycles, embryos begin implanting around days 3-5. Uterine contractions at this time can interfere with embryo positioning and the implantation process.

How does a reproductive doctor view the core of this issue?

From a clinical decision-making perspective, the core indicator we assess is the "benefit-risk ratio." In early stimulation, the benefit to the marital relationship is clear, while the risk of ovarian torsion is negligible when follicle diameter is <10mm, so moderate intercourse is permitted. However, by mid-to-late stimulation, the risk of ovarian torsion increases from about 0.1% to 1-2%. Although the absolute number is not high, if it occurs, it's an emergency that could lead to cycle termination or even ovarian loss – a risk most patients cannot afford.

The situation after transfer is even more specific. Studies have shown that pregnancy rates in patients who have intercourse after transfer are about 10-15 percentage points lower than in the abstinent group. While this isn't 100% causal, the physiological effect of uterine contractions on early embryos is clear. In the field of assisted reproduction, we follow the principle of "avoiding avoidable risks as much as possible." Therefore, from transfer until the pregnancy test day, I clearly advise against intercourse.

Three most easily overlooked details

Detail 1: The "Hidden Period" of Mid-to-Late Stimulation

Many patients think "once the trigger shot is done and eggs are retrieved, it's safe." In reality, the most dangerous period is from 3-5 days before egg retrieval to 1 week after. During this phase, the ovaries are at their largest, hormone levels peak, and the risk of torsion and premature ovulation from intercourse is highest. I once had a patient who had intercourse the night before the trigger shot. The next day during retrieval, we found the follicles had already ovulated, and the cycle had to be cancelled.

Detail 2: Ovarian Recovery Time After Retrieval is Longer Than Expected

Egg retrieval surgery seems minimally invasive, but the puncture sites on the ovarian surface take 7-10 days to fully close. Intercourse post-surgery carries not only an infection risk but also the risk of torsion because the ovaries are still enlarged. Even without pain or bleeding after surgery, it doesn't mean it's safe to resume intercourse early. Generally, it's safer to wait until after menstruation and an ultrasound confirms the ovaries have returned to normal size.

Detail 3: The Stimulating Effect of Semen on the Uterus

The risk of intercourse after transfer isn't just from uterine contractions. Semen contains high levels of prostaglandins (PGE, PGF2α), which are absorbed by the vagina and cervix, directly stimulating uterine smooth muscle contractions. Even without orgasm, contact with semen alone can cause contractions. Therefore, from transfer to the pregnancy test day, intercourse is not recommended even with a condom – while a condom blocks sperm, it cannot prevent the uterine response caused by sexual arousal.

Three most common cognitive misconceptions

Misconception 1: "It's okay if we are gentle."
The occurrence of ovarian torsion is somewhat related to the intensity of movement, but the key factor is the "mobility" of the ovary. An enlarged ovary is like a heavy grape; its pedicle (utero-ovarian ligament) is relatively fixed, but the ovary itself is heavier and larger. Even a slight change in position can cause torsion. No matter how gentle the movements, the mechanical impact from positional changes still exists.

Misconception 2: "If there's no pain after egg retrieval, I can have sex."
Having no significant pain on the day or the day after retrieval doesn't mean the ovarian and vaginal wounds have healed. Pain is subjective, but tissue healing requires a fixed physiological time. Clinically, many cases of pelvic infection after retrieval only show fever and abdominal pain 3-5 days later, making management much more complicated.

Misconception 3: "Intercourse after transfer won't affect implantation because the embryo is already placed."
After the embryo is transferred into the uterine cavity, it doesn't immediately "stick" to the endometrium. It floats freely in the cavity for 1-3 days, searching for a suitable spot to implant. During this time, any significant uterine contraction could change the embryo's position or interfere with the molecular signals of the implantation window. Retrospective studies have already shown that the clinical pregnancy rate in the group that had intercourse within 1 week after transfer was significantly lower than in the abstinent group.

Managing Intercourse Timing During an IVF Cycle in Hong Kong: A Practical Process Reference

Using the standard protocol of a reproductive center in Hong Kong as an example, a complete IVF cycle from starting the cycle to the pregnancy test takes about 28-35 days. Patients need to clearly identify the "red light zones" and "green light zones" for intercourse at each milestone:

• Before Starting the Cycle (Menstrual Day 2-3): Ultrasound confirms baseline antral follicle count and endometrial status. Intercourse is allowed, but contraception is needed to avoid unexpected pregnancy delaying the cycle.
• Stimulation Days 1-7: Daily gonadotropin injections, ultrasound + blood tests every 2-3 days to monitor follicles and hormones. When follicle diameter is <12mm, intercourse risk is low, but condom use is recommended.
• Stimulation Day 8 to Trigger Shot Day: Most follicles reach 14-22mm, ovarian volume significantly increases. Strictly prohibit intercourse from day 8 onwards until the egg retrieval procedure is completed.
• Egg Retrieval Day (36 hours after trigger shot): Intercourse is prohibited on the day of surgery and for 14 days post-surgery. The doctor will prescribe antibiotics to prevent infection and advise on the ovarian recovery time needed.
• Transfer Day: Intercourse is prohibited on the day of the transfer procedure and for 14 days post-transfer (until the pregnancy test day). Luteal phase support medications (progesterone, dydrogesterone, etc.) are used to keep the uterus quiet.
• Pregnancy Test Day: Blood test for hCG. If not pregnant, normal intercourse can resume. If pregnancy is confirmed, it is advised to avoid intercourse during the first trimester (first 12 weeks).

Top 5 Questions Patients Ask Most Frequently

Q1: Does intercourse during early stimulation affect the number or quality of eggs?
No. In early stimulation, follicles are not yet fully developed. Intercourse does not alter follicle recruitment or growth. However, hygiene should be maintained to avoid vaginal infection.

Q2: What are the symptoms of an infection from intercourse after egg retrieval?
Typical symptoms include lower abdominal pain (persistent and worsening), fever (temperature >38°C), abnormal vaginal discharge (purulent or bloody), and frequent/urgent urination. If these occur, seek immediate medical attention. Untreated pelvic infection can lead to ovarian abscess or hydrosalpinx, affecting future transfers.

Q3: What if I really can't resist after transfer? Can I use a condom?
It is not recommended. Condoms only block semen, not the uterine contractions caused by orgasm. Additionally, the lubricants on condoms might affect the vaginal environment and cervical mucus. Although the extent is unclear, it is also a potentially avoidable risk.

Q4: My partner has poor sperm quality. What if we need to have sex for sperm collection on retrieval day?
This needs to be discussed with the doctor in advance. Generally, it is recommended to ejaculate manually 3-5 days before the retrieval day to ensure sperm quality on the day. On retrieval day, sperm is collected via masturbation, not intercourse. If masturbation is truly not possible, inform the doctor before starting the cycle to arrange an alternative sperm collection plan.

Q5: What should I do if I have abdominal pain after intercourse during mid-to-late stimulation?
Stop intercourse immediately, lie down and rest, and observe if the pain subsides. If the pain persists for more than 30 minutes, worsens, or is accompanied by nausea/vomiting, seek medical attention nearby as soon as possible for an ultrasound to rule out ovarian torsion or follicle rupture. Also, contact your fertility center immediately to inform them of the situation.

Management Principles for Three Special Situations

Situation 1: History of Ovarian Torsion or Polycystic Ovary Syndrome (PCOS)
These patients already have larger ovaries, which enlarge even more after stimulation. It is recommended to prohibit intercourse entirely from the first day of stimulation, not waiting until the mid-to-late stage. Also, inform the doctor of your medical history; prophylactic antibiotics or increased ultrasound monitoring may be necessary.

Situation 2: Repeated Implantation Failure After Transfer
For patients with 2 or more failed transfers, the stability of the uterine environment is even more critical. Besides routine hysteroscopy and immunological tests, the doctor may recommend avoiding intercourse for the entire transfer cycle (from endometrial preparation to pregnancy test) to eliminate all unnecessary interfering factors.

Situation 3: One Partner is Abroad, with a Brief Reunion During the Cycle
This requires advance planning. If the reunion falls during early stimulation (within the first 7 days), intercourse is possible with strict contraception. However, if it falls during mid-to-late stimulation or the egg retrieval/transfer phase, it is advisable to postpone the reunion or accept an "abstinence for the entire cycle" plan. Don't take risks thinking "it's a rare chance to meet."

Risk Differences Among Patients of Different Ages

Age primarily affects intercourse risk through ovarian response. Younger patients (under 35) have good ovarian reserve, are sensitive to stimulation medications, produce more follicles that grow faster, and their ovaries enlarge more significantly. Therefore, the theoretical risk of torsion from intercourse during mid-to-late stimulation is higher. In contrast, older patients (over 40) usually have a poorer ovarian response, fewer follicles, and limited ovarian enlargement, so the torsion risk is relatively lower – but this doesn't mean they can let their guard down, as the endometrium of older patients may be more sensitive, and the impact of uterine contractions from intercourse after transfer is equally important.

Differences in Advice Among Reproductive Centers in Different Regions

Globally, there are some differences in advice regarding intercourse during IVF, but the core principles are consistent. Reproductive centers in Hong Kong generally adopt a "stage-specific detailed advice" model, allowing moderate intercourse in early stimulation, strictly prohibiting it in mid-to-late stages, and advising abstinence from transfer until the pregnancy test. Some centers in Europe and America have looser restrictions for early stimulation, some even allowing intercourse until follicles reach 16mm. Some centers in Japan tend towards "abstinence for the entire cycle," considering it the safest approach and avoiding confusion for patients about which stage they are in. These differences stem more from medical culture and risk preferences, with no absolute right or wrong. For patients, the safest approach is: follow the specific advice of your own fertility center, and do not adjust based on standards from other regions.

Practitioner's Observation: An Often Underestimated Communication Gap

In over a decade of practicing reproductive medicine in Hong Kong, I've noticed a phenomenon: many couples focus all their attention on tests, medications, and diet before starting a cycle, but very few proactively ask about "intercourse." Some are embarrassed, others assume "it should be fine." By mid-to-late stimulation or after egg retrieval, lacking clear guidance, some couples resume intercourse on their own. When problems arise, they come to the emergency room, often after irreversible effects have occurred.

Therefore, in the first education session of every cycle, I make it a standard item to discuss the issue of intercourse, and I ask the nurses to remind patients again on days 7-8 of stimulation. This seemingly small step can indeed prevent many complications. I also advise couples to communicate openly with their doctor before starting the cycle. Clarifying this issue beforehand is much less troublesome than dealing with the consequences later.