What is your opinion of tribadism? This is where one woman gets on top and rides her partner's vagina (this could be like having sex w/o the use of a dildo/butch cock). I've tried this before and I think it's kinda hot. There's other positions you could try when doing this and some positions would probably feel better than others.
I haven't had the pleasure of a butch cock yet although I would very much like to since I am pretty uninhibited in bed. In the words of Ludacris, I'm a lady in the streets and a freak in the bed! LOL!