Can I have sex when I am on my period?

Yes, you can have sex while on your period. It can get messy - there's blood, of course - but if you are willing to deal with that, then there's no reason as to why you can't. Indeed, having sex while on your period can actually be beneficial, as orgasms can help ease period cramps. Prepare by laying down some towels and planning a load of washing for after.