[Kevin Curry]

How can you magically 'know' who is homosexual and who is not?

Bingo. Homosexuality os a state-of-mind, a behavior, and an inclination to behavior. It is not a separate and special species or gender of human being. That's why so-called "gay rights" are nonsensical and absurd. How can a state-of-mind have "rights" let alone exercise rights?

Hint: it can't.

However, if a parent is made aware of or suspects a particular man possesses the gay state-of-mind the parent can and certainly mark the man for close watching.

[BikerNYC]

How can a state-of-mind have "rights" let alone exercise rights?

I don't disagree with you, but you can say the same thing about religious belief. How can a theist have rights or exercise rights, when being a theist is nothing other than a "state-of-mind, a behavior, and an inclination to behavior."