The problem: Your cervix becomes very soft when pregnant, especially the closer it is to term. Even gentle contact with the cervix is enough to cause bleeding, Dr. Williams notes. So if your man (or her toys) are well endowed, it could cause stains.
The Solution: This is a natural by-product of your body that prepares for childbirth, so there is no solution. But mention this to your OB / GYN, especially if there is a lot of blood, as it could be a sign of other concerns like cervical ectopia or placenta problems, adds Dr. Williams.