I recently read online about a semen allergy and being that I'm a hypochondriac, I'm now concerned. I've had unprotected sex with my boyfriend probably about 20 times now and he always ejaculates inside of me. I've never noticed any symptoms. If I did have a semen allergy would it have happened the first or second time we had intercourse.? I guess I'm scarred that it could be a sudden onset the next time we're intimate. Also, how would this effect oral sex? Thank you for all the help.