The sound is what does it for me. The sounds of sex make me so hot, and when I'm having sex and can hear other people having sex, it's like being at an orgy....
I must also say that there's PLENTY of porn out there that doesn't involve blonde silicone girls faking orgasms.
www.goodvibes.com has a wonderful selection of porn that's tasteful, beautiful, and hot as hell

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Sage knows our mythic history, King Arthur's and Sir Caradoc's
She answers hard acrostics, has a pretty taste for paradox
She quotes in elegiacs all the crimes of Heliogabalus
In conics she can floor peculiarities parabolous
-C'hi