This, combined with the trivial observation that not all lesbians have twinbrothers, suggests that if male hormones are inducing lesbianism, they are coming from elsewhere.
The characters of Cameron and Tyler Winklevoss, twinbrothers who attended Harvard with Zuckerberg, are actually played by two different actors but only the face of one, Armie Hammer (great grandson of industrialist Armand Hammer), is used.