it doesnt happen to me, probably because i cant ejaculate a lot of semen yet.
but, when i try to pee after i jack off, it stings, and i can see a little bit of some semen come out before the urine.
i dont know much about what you are talking about so sorry.
We can always live the world backwards
Venture onward and DESTROY THE FUTURE
We can always fight the new ideas
Put you hood on, we'll go back in time