It's got to depend a lot on individual anatomy, too. No way could I sit on my rami, there's just too much soft tissue there. The outer labia is where I have the most chafing anyway, and sitting right on them would NOT be good for me.
I wonder if this is much different between women and men ... men obviously have a whole lot more soft tissue *between* their pubic rami, but I don't know what the gender distribution might be as far as soft tissue *under* the rami?
Speed comes from what you put behind you. - Judi Ketteler