I prefer yaoi over yuri (and not trap yaoi, traditional yaoi with no accidents of mistaking each other for females), and most of the time when it comes to yuri it's actually futanari I prefer rather than normal yuri.
So needless to say, I prefer there to be two dicks (unless there's more than two, because then we need to increase the amounts of dicks in there), but one is fine no matter who it's attached to.