Yeah, poor sportsmanship to harvest females, egg-bearing or not. Easy enough to release them. If you're served females at a restuarant, be sure to raise a stink (that's one I won't live down with my friends anytime soon....)
SJ- the Washington Monument shape is how I also learned to differentiate the gender, and I also look for the "Capital Dome" shape on the females. Now, I learned to crab up in Maryland, so that must be the origin of the two shape names. We used to tie a chicken leg to a long cord and drop from bridges to crab back then. Now I just bait up my traps and plan a crab boil.