WARNING: This article contains language that some may consider offensive or obscene.

It's 15 inches long, 8 inches thick
Last name Almighty, first name is Dick.

--2 Live Crew, As Nasty As They Want To Be

Our research into sexual desire unearthed a number of genuine surprises that defy conventional wisdom. One of our most fascinating findings concerns the sex appeal of anatomical parts. Both straight and gay men enjoy ogling chests, butts, and feet. But for straight men, another body part was more popular than butts and feet combined, the same organ that tops gay men's preferences: the penis.

Heterosexual men are very interested in penises.

Here's the AOL search history of one fan of oversized organs, Mr. Amish:

big cocks
big dicks
monster cocks
tight pussy big dicks
long dong sex
big texas cocks
enormous cocks
gigantic cocks
big white dick sex
horny Amish women

The website Fantasti.cc is a community-based adult content aggregator, a social networking site where the predominantly male users rate and comment on more than one million images and videos. Out of the hundred top-rated images on Fantasti.cc, twenty-one feature close-up shots of a penis.

The number of searches for "pussy" in our Web search data just barely beats out searches for "dick," 1,096,614 to 938,134. Big Dick is a popular category of porn on all of the major heterosexual adult tube sites, including PornHub, the most popular adult video site in the world.

For men, the penis can never be too big. Just .2 percent of men wish they had a smaller penis, compared to 9 percent of women who wish they had smaller breasts. Indeed, there are more than six times the number of searches for "big dick" than "small dick." In our set of 42,337 most popular adult sites in the world, there are 1,072 Web sites that feature heterosexual porn with large penises, including Monsters Of Cock, Mr.Biggz, and Teens Like It Big. The number of sites devoted to small penises? Just three: PinkyDick, Little-Cock, and My Tiny Dick.

Men's second most favorite anatomical part.

So why might the male organ captivate men's attention? One possible explanation may lay with our primate cousins. Among New World monkeys, Old World monkeys, and the apes, the penis is a prominent and versatile social tool. The erect primate penis is used as a sign of male-male aggression, to mark territory, and as a sexual invitation to females. Of the invitation is witnessed by a competing male, the erect penis can provoke hostility and attacks. When male Savanna baboons meet, they frequently perform an intense greeting which scientists have endowed with the technical term diddling—"the fondling of the penis and scrotum."

It may also be a visual cue that motivates males to copulate with a female shortly after she has mated with a competing male—what biologists call a sperm competition cue—the subject of a future blog.

Illustration by boymeetshero.com. Copyright 2011 Billion Wicked Thoughts.

About the Authors

Sai Gaddam, Ph.D.

Sai Gaddam, Ph.D., studies biologically inspired models of machine learning. He is co-author of A Billion Wicked Thoughts.

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