The semen --- I'm talking about semen, which is a fluid, per se --- goes into the genital tract. That is the definition of the marital act. That's the one unique act that by definition consummates marriage. It's what makes the whole encounter procreative in form, even if not in effect.
That's why you can't have "marriage" with a man and a man. They can't perform the marital act, duh. They get the whole live gamete shipment down the throat or up the caboose, poor sods, because they don't have a kosher place to stick it.
I'm not going to get any more explicit. Note this: husband and wife are really quite at liberty. Do what you want, but don't forget the marital act.
Wow! Great clinical lesson! lol
And this doctrine of “marital act” comes entirely from Onan?