I prefer sex, in part as there's a chance I might get off, but also with oral I often get a tired jaw. At least with most of my clients there's a lot more work to ensure I don't get teeth in the way. So it often takes a lot more concentration than sex does. That's easy, whip a rubber on, if on top move for my pleasure, if on bottom adjust position slightly and I'm getting a lot out of it. Oral is more one sided.