Because, just like you can still have sex, you can also still get pregnant when you're having your period. Great question. Although it will be messy (and may cause a small crime scene on your sheets) you most definitely can have sex during your period. It can even help with cramps and improve the period blues. Apr 2, - There is no reason not to have sex on your period - here are 13 reasons why you should do it, including alleviating cramps and making you feel.