The Physiological Differences and Requirements of each.

There are numerous ways to tell if the saddle you’re riding in is a male or female saddle. The first tip is the easiest for riders to see and feel. Sit in your saddle with your feet out of the stirrups and allow your legs to hang freely. Do your knees and toes point out? If so, the twist is too wide. Male saddles have a wider twist than female saddles due to the angulation of the femur and the different musculature of the thighs.
Secondly, if you seat yourself in the lowest part of the saddle, are you comfortable? Male saddles are shaped with a roof like peak which can be downright painful for females as it presses directly against a region with thousands of nerve endings. Unlike males who are able to position themselves left or right, women do not have that ability and thus in order to relieve the pressure find themselves sliding back in the saddle. A female saddle has a cut out at the front to alleviate any pressure against the crotch. If you sit in your saddle and find your instinctively roll your hips back or slide back, you are in a male saddle.