The singer would be a definite no... way to much of an attention whore, and used to the spotlight. Sex would be all about them.
Guitarists - eh -- a little bland - really probably wouldn't stand out...
Bassists -- now we're getting somewhere... they stay in the background so life isn't all about them, plus are part of a team, they know they can't be the band all by themself so sex would be give and take.
Drummer -- Todd Rundgren's song "Bang on the drum" goes thru my head - -so I'm guessing the stamina would be there... plus there is that rhythm thing...
So it's either bassis or drummer for me -- and honestly - it's more about quality than quantity so I'm going with the bassist
I have put way too much though into this.