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My friend at the club tonight (SNSFW)…(r/WTF)
Men have three major sexual cues. Tits, ass, and sperm competition. The penis is important due to it’s role as a sperm delivery system and thus it is a major sexual cue and synonymous with sperm competition. Sperm competition is a sexual cue because of the word competition. Competition, in the sexual realm at the very least, gets us guys all riled up. “Who’s that bitch been fuckin’ while I was gone!” The site of a penis in the context of sex triggers desire in the brain. Not for the penis, but to increase desire for the female in order to guarantee it’s our sperm that impregnates and not the other dude. Hardness of the erection, sperm production and various other biological triggers pop in such a circumstance. Cuckold porn is popular for this reason. Why would a man get hot wathcing another man fucking his wife? Because it triggers all that shit and makes the sex more enjoyable. Yeah biology!
If you’ll notice there are no huge dicks in female targeted pornography. The obsession with penis is a male thing, not a female thing. Most females wouldn’t give two shits about the penis. The shemale, or tranny, (both are offensive terms BTW) is a part of male fantasy. It targets all three major male sexual cues.
For further interesting reading regarding this subject consider: A Billion Wicked Thoughts
It’s not a the greatest book in the world, but studying sex is very difficult in our culture and they’ve done the best they can with what we’ve got. =)
P.S. I am not an Amazon affiliate.
Edit: I meant cues and not for everyone to start lining up in queues. =P XD
Edit 2: I don’t remember it being as prevelant in the book but as the video linked in logcats’ post below mentions the feet are a fourth major sexual cue.