A lot of submissive men get off on the fantasy of slurping some meat puppet's DNA out their wives' snatches. Doesn't make it any less relevant in porn than tritone's single-minded pursuit of girls who'll take black cock, or Ben's quest to infect Ceara with his peculiar strain of genetically-engineered rabbit herpes.
Deal with it, Fuckwhore, by making porn which exploits the niche.
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I also am subcribe to postal pornography - CAOH