>>281 We may not be getting an accurate view because when they sit with their knees up it makes the old man point upwards due to pressure of other objects from below (if you know what I mean!). I think we are getting a telescoped view. The perspective is all wrong. And the glimpse is so brief!
That said I have always thought the visible bulge was mostly balls (or so the famous Cannes blue suit pics suggested- you could actually see their individual outline, the shameless boy!).