Eye contact, DFK, passion to the extreme...complete mental connection, and the few times I have had had emotional connections. Basically, sensual and passionate sex. Eye contact during sex.
But, just give me a naked woman, her touching me, and me touching her and I am good to go
Oh, and I have this strange fetish - I LOVE hearing people get it on - neighbors, if I am at a hotel. Not seeing what they are doing and wondering what the guy is doing to make the woman sound like that...so incredibly hot.
Nothing hotter than hearing people next door while getting head, and seeing her eyes look up at you. Damn.
Notice a recurring trend? Here's a hint: eye contact.