Hey, in Ancient Greece it was COOL to be bisexual. In fact the, for men, the company of men was preferable to the company of women. Society has just gone completely backwards in acceptance these last 3000 years.
Yes, the proliferation of the Abrahamic religions, each of which deprecate homosexual acts, has demonized the practice of homosexuality far greater than any other historical factor.
In other words, if Abraham was never born, all of our asses would probably be a bit more sore.