When my wife and I first started out, she said reverse cowgirl was her favorite because she could finish like *that*. That was with her ex of 15 years – an abusive alcoholic who could only get it up once every 2 months or so. So, it was important for her to get off fast, otherwise.....
Every now and then, I tell her we should do it since we haven't done that position in a while. Now, she has trouble getting off that way! She says she so much prefers to look at me in the eyes and kiss me as she rides me. That's what gets her off now.
However, I do sure love looking at her ass and her strong back when we do the reverse cowgirl.