During sex when the male is about to ejaculate he inserts several coins of varying sizes into their partners rectum and then seals them in with his semen
Oh man Josh and I got really freaky last night! He gave me a Wisconsin Wishing Well!
When a man ejaculates into the belly button of his partner forming a reservoir of semen, the man then pisses out a kidney stone through his penis into the reservoir, thereby creating the noise of a coin being dropped into a wishing well.
Boy: Hey baby where do you want me to finish?
Girl: In the belly button...
Boy: ok but i think i have to piss a kidney stone, lets make a Puerto Rican wishing well.
Girl: ok and maybe tomorrow we can try a mongolian horse race.