If her bra don’t creak like an old ship when she moves, I ain’t interested

That has nothing to do with the topic of whatever “semen retention” is. Also nice puritanical values you’ve got there, very 1640 of you 👉👉

If it’s real it should be very easy to produce peer-reviewed results showing that conclusion.

Unless such evidence is presented, believing “semen retention” is anything is about as founded as believing in crystals or astrology.