i'm guessing they're making $4k/scene on the gay side. realistically, many of the guys in today's double-anal "straight" porn are probably gay and bi, just not attractive-enough to hack it as a butt-pirate.
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"She has no waist, no arse...an interesting face...but all we are really worshipping is two bags of silicone"
Martin Amis "honoring" katie price with a character bearing some of her traits