Holy crap...what a waste of a good woman. Yikes could you imagine picking up he/she in a bar, thinking you scored good. Than take her home only to find that, just when you good and horny.
Now you have to do a touch check to be sure???
Oh yeah, good idea! "I'd love to take you back to my place, dear. But first I want to check to see if you're a guy. Can I grab your crotch, before we leave, please?"
You wouldn't be getting any if you used that line.