Sexual intercourse should be timed to coincide with ovulation. Review the critical basal body temperature chart prior to ovulation. Since sperm can remain on the mucosal surface of the uterus for approximately 48 hours and can be continuously active, it is necessary to have intercourse at exactly the same time as ovulation. Usually sexual intercourse is held every other day before and after the woman’s ovulation. Sexual intercourse should not be too frequent during the week, but 1 to 2 times a week for young and middle-aged couples is appropriate. 1. Determine the ovulation day: you can use thermometer method, ovulation test paper method (David ovulation test paper, usually in the morning of the eighth day of menstruation urine test, about 14 days so from a bar to 2 bars means ovulation) or B ultrasound ovulation test method. 2. The male partner does not have intercourse for 3~7 days before ovulation. After 3 – 7 days of non-ovulation, the quality of sperm is the best, especially the overall function of acrosome enzyme is stronger. Generally, it is the 7th to 8th day after the menstrual period to have intercourse once, then the day of ovulation to have intercourse once, and then 24 hours after the day of ovulation to have intercourse once, (sperm in the uterus can generally survive 3-5 days, while the egg generally only survives 24 hours so, so the male party a little early to be ready oh). 3, during intercourse in the woman’s buttocks a pillow, after intercourse the woman continues to lie flat for 1 to 2 hours, will help the sperm swim, especially for the semen liquefaction incomplete people is very necessary.