Ned writes:

Sexuality is socially constructed? The moustache parade is going to be after you.

I can hear it now: Gay Person: "How dare you. One is born gay; one does not become gay. Everything in life is socially constructed except for sexuality. Duh, Mark."

What I meant in saying that sexuality is socially constructed is that we assign sexuality to others based on socially-constructed ideas of gender. A person's sexuality -- that is, who he wants to have sex with -- is genetic. A person does not choose to be homosexual or heterosexual. However, the very ideas of "homosexual" and "heterosexual" are themselves socially constructed. Other cultures have different concepts of sexuality beyond the binary sexuality (homosexual/heterosexual) with which we are most (un)comfortable.