Stephen King is brilliant. He really is, despite being a mainstream media darling. His books are held up as some of the finest examples of modern literature, are taught in schools, and have been made into Academy Award-wining movies. Not bad for a talent written off as just a hack horror novelist in the beginning.
And yet, there is an area of the man's writing that is consistently sick and twisted, even for the guy that gave us Pennywise the Clown, and that is how he approaches sex and its depictions. He is occasionally capable of a tender scene, such when Johnny Smith and Sarah finally spend one night together in the Dead Zone, or Tommy and Sue in the backseat of his car during Carrie. He's even given us examples of fine smut such as Nadine seducing Harold in the Stand, or Rachel soothing Lou in the bathtub with a handjob after a bloody day losing a patient in Pet Semetary.
But in general, whenever sex comes up in a Stephen King novel it's usually bad news, and will probably leave you filled more with crushing lack of faith in humanity than sexual stimulation.