Is it normal to have sex on my period

Look, when guys are horny, they don't care. However, if a guy is not really horny, then he will likely think it's gross. It just depends on the day. You might proposition your boyfriend for sex one day and he'll be totally down for it. On another day, he might turn you down. Basically, a guy's gross-out factor is inversely proportional to his current horniness. And if you start your period in the middle of sex, then who cares! Gotta finish what you start!