The sleaziest has to be Andre Williams, songs like Jailbait, Pussy Stank, Let Me Put It in, in fact the entire Silky album which has to be the sleaziest dirtiest piece of rock I own.
Some of the Reverend Horton Heats material has a very nice sleaze factor, have a quick listen to Wiggle Stick, Big Red Rocket of Love, and Love Whip and you'll get the idea.