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However, even with temperature charts or ovulation prediction kits, it is often difficult to identify the precise time of ovulation in advance. So, from a practical perspective, you should have intercourse several times around the estimated time of ovulation. Doctors have found that having intercourse once a week makes you 50 per cent less likely to conceive than having it every couple of days. Success rates do not appear to get significantly higher if you have sex every day. Sperm survives in the woman and is capable of fertilizing an egg for around two days after intercourse, especially during her most fertile time. In addition, there is no need to restrict intercourse at other times of the month. Indeed, the best plan is to have intercourse regularly every couple of days throughout the cycle. This avoids putting pressure on you both to identify the fertile time, obliging you to make love according to the calendar rather than by desire.