I thought of you when I posted this thread Irwin. Good to see you around buddy. Yes, you can keep both sexes as long as the female is not in berry.
Look at the last picture in this link: http://www.tpwd.state.tx.us/huntwild/wild/species/bluecrab/
This female is in berry, meaning she is carrying eggs. You have to let them go then by law.
BTW, my wife and I enjoyed more crabs, onions, garlic, sausage, and red potatoes during the Saints game against Carolina. That was a close one!