No, you don't understand. Facebook has a policy saying they won't disclose personal info, like what age you are.
You're 100% right. Sexual orientation, however, is not private and is publicly displayed - there is nothing to "disclose," the user discloses it to the whole internet voluntarily.
... but it is impossible to log in to most social networks without HTTPS
"In order to make an apple pie from scratch, you must first create the universe." -- Carl Sagan, Cosmos