Inspired by previous post and my experiences I can tell you 100% that your cum goes into your bladder. If you do it right, that is.
I had unmistakable amounts of cum come out after I peed. Even 5 hours after the fact, there is nowhere else it can go and it has to come out.
Source: https://www.reddit.com/r/aneros/comments/4at2dj/why_the_orgasm_is_dry/
Ah the old retrograde ejaculation!
As a teenager I read about a Chinese method of contraception that involves putting a firm but not hard pressure on your peritoneum just before you orgasm and all the cum goes into your bladder to be pissed out next time you wee.
I saved so many crusty sheets as a teen that way 🙂
Orgasm doesn’t necessitate ejaculation (internal or external) though