Can cum make you feel sick? or upset ur stomach?
Interesting question, What you are experiancing may not be chemical but emotional. If you have strong negative feelings about seman swollowing you could just be sickened by it. Orentals believe that there are great benefits from swollowing seman. It may be a man thing and a way to convince woman to swollow the ejaculate.
If it has any STD's in it, i'm sure it can make you sick.