I'm a 21 year old guy, and for a long time I've wished that I could be a mare horse. Being in the same pasture with other mares, gelding and a stud. Having my heat cycle start, and finding out how it feels to have the stud mate with me.
if that could happen, you may want to wait a few days before going back to being human, as you might be walking kinda funny.
You better go back to being you before the stud gets you, you might take on the first try, and stay that way even as a guy.