Hello, and I hope I can help you today. It is not harmful for women to have sex during their menstrual period, and many women feel increased sexual desire at that time because of increased hormone levels. When your bleeding is very slow, and it mixes with your vaginal discharge, it can come out looking brownish but that is not a symptom of any type a vaginal infection. There are no risks to your partner about getting infection from you if you have sex during your menstrual cycle. However, if you have unprotected sex, the increased lubrication from both your arousal and your partners ejaculation can mix with the blood left in your vagina, and when it runs out it may seem temporarily like you re bleeding more heavily. So after sex you may see a bit more brown discharge or some fresh blood but that is just blood that was already in your vagina being washed out. In addition, if sperm ejaculates inside you it can temporarily cause some increase cramping, and women also sometimes have some uterine contractions when they have an orgasm. So in summary, it is completely safe to have unprotected sex at the end of your period, and you are not risking yourself or your partner in any way. If you experience may increase menstrual symptoms at the time, that is not unusual but it is not harmful to you in any way. I hope that I was able to adequately answer your question today, and that this information was reassuring. Best wishes, Dr. Brown