To know God Is to Obey - Lukewarm Christians be warned, page-466

Break it down to each action.
A man is knowing he is going to get married to the love of his life.
He goes and gets drunk with mates on his bucks night.
He goes with his mates to a brothel.
The money is paid.
He goes into a room. He undresses.
He has a condom applied.
He gets down with it with a woman who has likely experienced this many many times.
He does this knowing he is to marry the love of his life.

Explain how they are mechanical functions that are enabled and not by will?