My boyfriend and I have been dating for several months, and are in a fairly intimate relationship. We have not had sex, and are both virgins. Whenever we go further than casual kissing, he becomes nauseas. He thinks this is his body's evolutionary response to the possibility of having sex. In my research, I've come upon much about post-orgasmic stress involving painful headaches, but his sickness is focused on his digestive tract, and always happens before orgasm, never afterwards. Does anyone else have this issue? What have you done to combat it?