I am male and have always enjoyed waching females sit on their haunches. I think this goes back to when I was sat on by a girl at Junior school and continued when other females have pinned me down in front of their friends.
However, I had a wierd one off obsession with another schoolboy when I was about 13. I had watched him wrestle another boy and sit astride his head with these great looking upper legs and fantasized about him doing the same to me. I didn't fancy him in any way, just his legs.
I managed to get round his house one day and challenged him with the intention of losing despite the embarrassment. He was wearing shorts. I found I was slightly stronger than him and pretended to win before eventually letting him get on top and he was sitting on my chest. He held my arms down and I tried to wriggle so he sat astride my head. I was completely pinned down underneath those legs and enjoying it before the phone rang and he released me.
I wrestled him separately twice more and let him complete a 3-0 humiliation. The first was in a public park in front of hundreds when I let him easily sit on me and pin me down for ages and the second in front of some females. They were egging him on wearing their tight jeans but none of them ever sat on me instead.
I think I must have used him as a girl substitite but still enjoyed all the embarrassments. However, I wouldn't now like the thought of a man doing the same now.