You’re Making Me High by Toni Braxton - this song is pure, humping, pumping sex.
Ok, people might think I’m weird, but… Physical and Suck by Nine Inch Nails. I really enjoy the whole Broken EP, though it’s those two songs in particular that do it for me!
Voltaire’s “The Night.” http://www.youtube.com/watch?v=f7BpmjuQzCE
“The night, she calls me … she calls me … she calls me …she calls me … she sways in her velvet dress, and pulls me towards her in the dark …”
Prince’s “Little Red Corvette”, closely followed by darn near anything off of 1999.
I did think of another:
Lee Wiley singing Here in My Arms.
“If” by Janet Jackson and “Gett Off” by Prince.
Good choice, but I think “International Lover” and “Lady Cab Driver” go one better.
Keeping the Prince vibe going, it doesn’t get much sexier than “If I Was Your Girlfriend” and “Do Me Baby”.
And how could I forget “Irresistible Bitch”?
This might seem like a weird offering, since the song didn’t make me hot as much as it made me feel the singer’s blistering heat, but the first time I heard Melissa Etheredge’s “Somebody Get Me Some Water”, I thought my radio would melt.
I’ve always found “Smoke” by Afghan Whigs to be an incredibly sexy song.
I’ve been working on this aria in my singing lessons and I never thought of it as sexy, just regularly romantic. It *definitely *wouldn’t sexy be the way I stumble through it.
Yep. I just listened to them both… Bobbie is good… Dusty is better.
Ooops? Wow, I thought I was posting to Cafe Society. Out of curiosity what was my spelling typo? Dang it, I knew I was way too tired to be on the computer yesterday.
“Slow Ride” by Foghat can still get me going.
Kate Bush’s tribute to Molly Bloom~ The Sensual World
Naughty, Naughty by John Parr.
You typed, “Man that song it hot.” I just assumed you were so overcome with, ah, heat, that you didn’t notice it. Thankfully, a cooler head prevailed. 
My contribution is Moondance by Van Morrison … but I admit I may be influenced by its use in An American Werewolf in London. Also, when I saw your OP, my first thought was, “well, there’s a reason Tarantino used it in Pulp Fiction!”
This 
When I saw the thread title, it’s the first song I thought of.
Gris-Gris by Dr John. The whole album, but particularly the semi-title track, Gris-Gris Gumbo Ya ya.
Hmmm, I guess I find Voodoo sexy. OK.