If having sex at that time of the month has you or your mate seeing red, then you might hold off in favor of those other three weeks. Believe it or not, there are a few benefits of having sex on your period. A survey done by MensHealth.com found that women, not men, were usually the ones to put the brakes on getting busy during Aunt Flo's visit. More than 75 percent of guys said they would love to have sex with their serious girlfriends or wives while they're on their period.  Women cite the "yuck" or "mess" factor as a major reason for their hesitation, but there are several steps that prevent it. A dark towel on the bed can minimize sheet stains, and the position you're in can help, too. Fight gravity by lifting your legs and keeping hips up, or allow him to enter from behind.
A couple of birth-control methods (yes, you'll still need that) can help minimize mess as well. A male or female condom will keep things tidy for him. You also can try a menstrual cup, like Softcup, which is placed on the cervix and emptied out when full. For the ultimate mess avoidance, take your lovemaking to the shower, where everything will go right down the drain. Perhaps you're not feeling well – cramps, headaches and blemishes may plague you. The good news is that sex helps with cramp pain and allows you to sweat out all those impurities! A few words of caution – while you're less likely to get pregnant while menstruating, it's not out of the question. Take precautions if you don't want to get pregnant – or get an STD, for that matter. Both partners can receive and transmit STDs, regardless of the time of month.