Those "9/10 times if a guy approaches her without due cause he's got sexual intent" is a actually just a stereotype which if we actually measure it would shrink down to single digit percent. Male sexuality is commonly over exaggerated and part of the expected gender role, with female sexuality in contrast has the opposite expected gender role. Since no one want to perceive a man as being outside his gender role we attach this assumption of "horny man", in the same way we attach "innocent girl" to a woman. When a man approach a woman both gender roles and expectations are applied and thus we get this perceived situation.