What R. Kelly song is this?

This is a cartoon video of a R.Kelly song, but I don't know which one it is! So if you know please leave a comment. As I was saying it is a cartoon version of a R.Kelly song but it's been revamped by the hilarious "Weird Al"Yankovic. He has remixed alot of famous songs, so I'm guessing this song is or was pretty famous! You know I don't mean to be rude to all you R.Kelly fans out there, but he is just plain weird. Wow that makes you think "Weird R" Kelly. You think thats a good name to show how weird he is!