Random thought but speedsters would be perfect bottoms to torture. Sure they may finish quickly but they would recover just as quickly. Since their perception of time is altered to see everything in slow motion every time you touch them,no matter the speed, would be like the slowest edging possible for them. Just carrying them has them stuck in your embrace unable to go anywhere. Imagine they cum hard enough to get a Charley horse and how fast their legs would shake, to the point of vibrating. Plus, all that running would definitely give their lower half a lot of shape, imagine the way they'd move their hips.
The perverted use of superpowers need to explored more, we all know how Spider-Man likes to use his webshooters, and we've all mad the same jokes about shapeshifters and Mr.Fantastic