I'm sad that I didn't get to chime into this conversation sooner.
I have ERP'd and will again, but only under the guidelines of making sense for my character. However I find a lot of character development in the act of "doing it."
I can think of endless examples where the act of having 'sex'
is as important as the interaction leading up to it.
I think this way because there are levels of power established in the act of doing it that aren't easily replicated in other ways. I'll leave everyone's undoubtedly dirty imaginations figure out the rest of that dynamic.
Even if you don't ERP out the scene, as discussion still needs to happen about the dynamics of that sex. Intimacies need to be shared between characters so to speak.
When Logan was with Usagi (another male driven, female character) we never ERPed but we still had conversations about the sex, like what was going on behind those closed doors. Not in a totally erotica way, but things like; who's dominant, what's going on behind the curtain, what kind of bedroom relationship is there?
I actually find it really frustrating when people give fairly poor answers (despite being great RPers otherwise) about the sexual side of their being.
For instance, some powerful figures in history preferred to be submissive, or their power led them to do strange and or wonderful things in the bedroom. Fascinating stuff that for me is only truly accessible via ERP.