Olya
Captain Verd
For the second part, I refer you back to my hypothetical situation. Not everyone can be held to the automatic honesty thing due to negative past experiences.
We all meandered through our schooling haphazard; so, to God be thanks,
Their negative past experiences do not justify them in putting others in a position where future negative experiences will be created.
Do you not see how 100% unfair it is to the other person? I'll give you a differing example. Suppose you go out with someone who has epilepsy and that person does not tell you. What will your feelings be when that person goes into shock (especially if you've never had this experience before)? Was that person justified in not warning you? Of course he was! After all, some people turned him down in the past, he was made fun of in high school - clearly, having you stand there beside yourself not knowing what to do is totally reasonable.
...it's easy, without too much fooling, to pass for cultured in our ranks. 
Yes, it does. If I'm a transsexual, and the last guy I told held a knife to my throat and threatened to kill me if he ever saw me again, why should I be forced to tell you about my transsexuality? The little weird feeling you'd get once I told you about my secret p***s is far, FAR less than the horror I would have felt being held at knife point.
Your view on the subject is extremely selfish. People should tell you their personal medical history despite the fact that they may be harmed as a result so you personally don't have to feel funny at all is completely outrageous and unsympathetic. I would never expect someone to disclose personal information like that to me after our first meeting. Assuming so would be extremely rude and intrusive on my part.
My boyfriend did not tell me about his schizophrenia until we'd hung out a few times. Why? He liked me, and was afraid I'd run off like allother girls he'd told. The fact that he waited to tell me did not change a single damn thing. he wasn't lying about it, or trying to trick me into dating him before letting the dirt out. His fears and feelings on the subject were and still are far greater than mine probably ever will be. It's his right to chose who he tells that information to and when, because unless he becomes romantically close to someone, it's really not anybody's god damn business.