this is a really funny question, I'd argue not that many actually do, and that's probably because I myself don't do so a lot either FKLJFLKSAJFLKSA

I would say the ones who do it the least are Leena, Cupid, Darla, and Pacifica (mostly because if they're wanting to do anything like that, they'll just seek out their partners respectively). Leena does it the least because she's on the ace spectrum and isn't often as interested in doing that, plus again... she's got a wife to help out when she's in the mood.

Electra probably does it the most and hell, probably does mutual masturbation with her partner. I know for a fact she uses toys she's nuts like that BSAKJSAKLDJASDK

The surprise bonus answer for who does it the most would be Pepper (aka Meg). I don't know how to explain why they are the one that does it the most other than they get so frustrated they just GO at it back to back 💀