THIS totally, he invests himself in his time and on his terms. He willfully controls as much as possible, that is his comfort zone, so that includes relationships, sex and well everything else that doesn't involve work. The man even sees food and non-work related communication as a necessary evil/diversion so why are people surprised?

I've met men who have no interest in sex until they are actually involved deeply in a relationship. It's not something that is seen as a wholesome male attitude so for most people I'm guessing it's one of those invisible truths of life.