Around these parts (Southern Cal), I would say I see more dudes with Diesels than chicks by about a 5 to 1 margin. In fact, I will give a girl an extra look if they have a nice pair of snug diesels on. It's funny that I didn't really notice it before until it was brought up, but almost all the girls wearing diesels are on the taller side.
But by far, I see the girls around here wearing Sevens (or other jeans) over Diesels all the time. I don't see a girl in Diesels everyday, but every I see Sevens, sevens, sevens..... I think Sevens are nice jeans (for women). But Sevens for men are still girly-man jeans. J/K
But to the matter on topic the 85-90% male ratio might be right on. At least around here.