Bluerose, sometime back I read an apothegm that really resonates with me: An intellectual is one who has found something more interesting to think about than sex. Though I would not identify myself as an intellectual, I think there is some truth in this statement.
When I was enlisted in the US Navy sailing around your part of the world, all most sailors could think about was drinking beer, football, and the girls they slept with.
I put myself through college doing land surveying, and while the sex talk usually wasn't quite as graphic, it was still there.
Now I am a professional and can't recall the last time I was involved in a conversation discussing sex graphically. In Texas at least, sex is just not discussed in polite society.
What I'm getting at is that if this type of conversation bothers you, you may want to find other people to associate with. It is just my opinion, but our sex lives are private matters and should remain that way.