If you're afraid of what your boyfriend will think about having sex on your period, talk to him! I thought my boyfriend would be grossed out, but he's totally fine with it! And tip: keep BLACK towels around! You don't have to worry about ruining nice towels haha
Wow never heard that having sex on a period can create Std ofcourse if he has one or vise versa rather you have your period or not you will contract an std and I use to be grossed out but it's not as bad as you think