I think LRD's would make a bit more sense.
If you're looking for extreme sexual gratification, I doubt you'd "ride" something like a donkey. They have no gusto at all. Bull? Monster Truck? Horse? Cheetah? Definitely.
Also, upper body strength isn't nearly as important as the lower body during sex. Especially if she's riding him. (I'm aware throwing a truck involves the lower body, but I would say his agility and powers are much more of a sexual asset; his ability to jump clear across a building!)