Well, I know i there is ANYTHING at all we are compatible about, it is genetically. We are chemically DRAWN to each other, hence the reason we still fvck four years after our breakup, even though we cant stand each other, and have nothing in common, and I aint the best looking guy around, but to her, I am the hottest man alive. This is all chemical, and biological (as well as some other kind of fvcked up emotional codependency we have with each other) I've gotten her pregnant twice, even though she is medically unable to get pregnant. I think its safe to say we're genetically compatible. Like I said, its certain proteins in my actual semen that she has a mild allergy to. This could be something in my diet. This only happens when I blast MANY loads in her in a short time. If we hang out for three days, we will fvck close to ten times. I may blast a couple of those on her face, and a couple more on her tits, but there may be five or six loads inside her by the time we part ways. Its only then, that she MIGHT have a mild reaction.
Bad allergies can cause respiratory problems in severe cases. Mine has a very mild reaction, but due to how much I actually nut inside her (which I dont do anymore, cuz we dont want to get her pregnant again) is what makes the reaction happen.
For example, I dont have allergies, but last year I was working outside around lake tahoe, and the tree pollen was so intense, that EVERYTHING had a layer of yellow dust on it, and it made me feel very strange, and I would take clariten. If I had real allergies, I would have been in HELL. Its the sheer amount involved thats the problem.