Gay people largely aren't "sharing" any more than hetero folk take for granted they share. So if you're a man and you're dating a woman or married to a woman you never talk about that? That would be revealing you're hetero. You've never said "Last weekend my wife and I went to the movies"? That's revealing you're hetero. If your wife is pregnant, you didn't talk about that? That's confirming that you (presumably it was you) had sexual intercourse with your wife. When you were first becoming sexually active you never talked with your friends about what that was like, asked for tips, advice, etc? You never asked a friend if they were dating? That's showing you had an interest in their "proclivities."