Can sex affect when your period comes? Like this month I started on the last day of the month and I was curious cuz my boyfriend and I have sex a lot almost everyday sometimes even twice or three times in a day. We started having sex in April and my period has never come this late before. It normally comes in the mid 20s of the month and so I was wondering if sex could affect my cycle? Anything would be greatly appreciated!! Thanks ladies 😊😊