Actually, there's been some serious research on this, starting back in the 1930s: "The Relation Between Sexual Orientation and Penile Size." One suggestion is that gay men were more likely to lie about length and girth, and hence the finding of greater penis size among gay men. Weird, I know. The problem is that NIH is still funding this type of research, for example, "The Association Between Penis Size and Sexual Health Among Men Who Have Sex with Men." The abstract's at the link, and you have to admit it's pretty fascinating:
Men with below average penises were significantly more likely to identify as “bottoms” (anal receptive) and men with above average penises were significantly more likely to identify as “tops” (anal insertive). Finally, men with below average penises fared significantly worse than other men on three measures of psychosocial adjustment. Though most men felt their penis size was average, many fell outside this “norm.” The disproportionate number of viral skin-to-skin STIs (HSV-2 and HPV) suggest size may play a role in condom slippage/breakage. Further, size played a significant role in sexual positioning and psychosocial adjustment. These data highlight the need to better understand the real individual-level consequences of living in a penis-centered society.Well, that's scientific language for who's on top, etc. And this bit about the "penis-centered society." That sounds more from radical gender studies than queer theories. But who knows? I had no idea these were academic specializations while I was in grad school.
See also Fox News, "NIH-Backed Study Examined Effects of Penis Size in Gay Community."
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