Question: why does my stomach hurt when he comes in me?
Answer: 03/6​Reaction to sperm REACTION TO SPERM: Another reason that can be triggering the pain is the sperm itself. Health experts say that as sperm is an irritant to the uterus, the uterus can react when in contact with sperms. This can result in uterine contractions, which in turn causes stomach pain and cramps.