I would think this would be more practical and useful for men.... lol. In fact, didn't Levi's or Lee or some other manufacturer recently come out with men's jeans that have such a gusset?
ETA:
Omg they did. And guess what they named them? "Ballroom" Jeans!!! ROFLMAO!!!!
http://www.duluthtrading.com/store/m...oom-jeans.aspx