That’s what happens once you shoot your goo. That’s not Erectile Dysfunction, that’s just the finished state. ED is difficulty getting and maintaining an erection, if you’re going for hours before you orgasm, you don’t have ED, you might actually be desensitized. If you want a lot, you’ll probably want to cut back significantly on that, especially in the leadup time to having sex, and loosen your grip when wanking.

It sounds like you have might have a bit of warped perception based on pornstars seemingly going for extended periods of time and having orgasms without losing hardness, just remember, that porn was mostly likely multiple hours or even days of filming and is edited down into a single video.

Might have been a screenshot from those old Sex Kitten flash games on Newgrounds

A looot of Pokemon characters, especially the main player characters would probably be a good start for compiling a list together.