birth control, you need to keep track of the length of your menstrual cycles for at least What are the safe days to have sex when using the calendar method?.
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If you're trying to get pregnant, having sex on your period won't likely help you to conceive unless your menstrual cycle is less than.
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Many people wonder if having sex during menstruation has side effects. Unless a person uses birth control or has a same-sex partner, there.