Once a day, every day during your fertile days. Having sex more than 5 days before the day of ovulation or having sexual intercourse the day after. Dec 15, - If you're hoping to up your fertility odds, Dr. Ghofrany suggests starting to have sex 4 to 6 days before ovulation and then 4 to 6 days after. 7. Having sex every day. Believe it or not, too much sex can decrease your man's sperm count, which can then take a few days to rebound.