Mostly, they're all around sex in a very mechanical way, no love, no passion, just the act.
One of the earliest I remember was that I was part of some grand science experiment. It all took place in a laboratory, white walls, totally clean.
I had to pass tests first, proving I could perform the act on demand. I'd have to go into a room, like an interview, stand in front of a desk where some [women] doctors were sitting, get naked, get hard, bring myself to a climax, while they watched impassionately. Finish up, leave the room, nothing said.
and it goes on from there. I'm sure this won't be a popular read, but I feel the need to get it out, so the rest might follow