[SeeSharp]

Homosexuals are promiscuous because when given the choice, homosexuals overwhelmingly choose to be promiscuous.

Now carry that same logic one step further and we see that homosexuals are not promiscuous because they are homosexuals. Rather, they are homosexuals because they are promiscuous.

[fwdude]

I'd say, rather, that they are promiscuous because it is the innate nature of homosexuality to impersonalize its erotic focus. One hunk of flesh and skin is pretty much like another, once you jettison the idea of a deeper bonding of souls that uniquely characterizes the complementary nature of a heterosexual couple.