Based upon your queries, P...you've either lead an interesting life or have an active imagination! I won't be answering this question, as I don't think a man can get ill from overindulging in vaginal juices. I will say that I've heard rumors about hollywood types (male and female) that ended up getting their stomachs pumped after gorging on guy goo, so I imagine it's possible.
I think that Rod Stewart thing is an urban legend. The reason I ask is, I almost always feel nauseous afterwards and I don't know if it's physical or just psychological.
Well, that is about how many guys it would take to test and see if you get sick........lol....... shucks, we'll never know. Really, it is probably just you thinking about your stomach too much after swallowing. I'm sure that it is psychological. Aside from the liquids, most of semen is protein.
I've seen porn clips where Asian girls drink like a fucking quart of semen. OMG! I can't even imagine.
Anything beyond moderation can cause the body to revolt, but in your case P., work through why you may feel sick after one slug. Maybe you really, really don't like to do it. So quit it! There's more'n one way to skin a cat. The SO must be a little insensitive to let you keep flubbing your system. Dump him, while you're changing things. Or keep a cuspidor by the bed and make him empty it!
I don't mind swallowing cum at all. And I never actually get sick. I just feel a little queezy sometimes and it seems an odd contradiction that my mind loves it and my body hates it. Or maybe it's the other way around.
The only time I feel a bit sick, is when it tastes bitter. All depends on what my b/f ate, the taste does vary a bit.
I took (i think) six loads of cum one night and was OK. Its not like each guy cums that much -- it probably would barely amount to a table spoon if added all up. Also, it was over a few hours. I did get sick the following morning, but i think that was because i was hung over.