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I first encountered the “creampie fetish” in 2007 as I was interviewing for my book Insatiable Wives: Women Who Stray and the Men Who Love Them (2009), which discussed the psychology and biology behind couples who deliberately shared the wives sexually with other men.  In that lifestyle the creampie, or a man’s ejaculate, trickling slowly from the woman’s vagina, is celebrated as a sort of Holy Grail, demonstrating the wife’s defilement by another man (though the word defilement sounds much, much meaner than these couples usually intend it).  In Insatiable Wives, I discussed the creampie it related to the psychology of this lifestyle.  But, over recent years, the creampie fetish is no longer relegated to the cuckold fans, but appears to have gone “mainstream,” popping up in porn and sexuality discussions at a much broader level. Since 2005, Google searches for “creampie” have quadrupled, with the most frequent searches involving “creampie porn” and “anal creampie.”  Pornhub recently released interesting user data,

also showing that creampie is a highly sought-after form of porn, especially in more politically conservative states.  Jokes about creampies are found in movies and late-night comedy talkshows, and Miley Cyrus even performed at a “Christmas Creampies Concert” in 2012.  Despite these interesting data and trends of sexual interest, no one has written about the potential psychological and sociological implications of growing interest in this fetishistic desire (like many of my colleagues, I use the term fetish to describe a strong sexual interest or predilection, and do not imply that this desire is inherently pathological or evidence of disturbed sexuality). Sperm Warfare is a theory describing behavioral and biological adaptations which exert influence over whose sperm is most likely to fertilize a woman’s ovum.  Accepting the premise that humans evolved in a promiscuous, nonmonogamous environment where a man’s sperm had to “compete” with the sperm of other men in a woman’s vagina, sperm warfare suggests that natural selection acted upon…