Dr. Magtibay explains why endometriosis causes a woman pain and discusses why tying a woman's fallopian tubes will reduce her risk for this condition. He also explains that intercourse during menstruation does not increases the risk of developing endometriosis.
It’s a little poorly understood as to why endometriosis causes pain, but we think, and as you can imagine, when you have that lining of the uterus implanted somewhere else in the body and it’s responding to hormones, the estrogen, and it’s growing and potentially bleeding when a woman has her period, you can imagine that that blood in that active tissue in places outside of the uterus if it’s irritating the ovary for example, could potentially cause pain. But it’s still fairly poorly understood.
She does have a reduced risk of developing endometriosis, interestingly, and just like she has a reduction on the risk of ovarian cancer. And we don’t necessarily know why that happens, but they do have a reduced risk of developing the disease.
To our knowledge there’s no problem with having intercourse during menstruation and it does not increase the risk of developing endometriosis.