re: should it be a crime to have sex w/ someone w/o revealing certain things?

1. If you have an STD - absolutely. Some states already recognize that as a crime, and all of them should
2. If you're underage - torn on this. If a guy picks up an underage girl at a bar that requires her to be 18 to enter and she doesn't tell the guy she's underage, she should be responsible for that. Now if the guy picks her up from a high school football game he should know. There should be a "reasonable to assume the person is of age" clause that applies to situations like meeting someone at a bar who got in with a fake ID
3. Tranny - honestly this is on you. If you don't realize she was a he until a couple days later, that's your problem. And if you realize it before initiating the act, it's your decision how to proceed