Is it normal that i want to seduce some people so bad?

Okay look, everytime I have classes with some friends of mine they usually sit next to me and it's like I imagine myself on him pressing my body against his chest making out. But not normally make out, more like heavy make-out. Its everytime I sit next to spme of my friends. It doesn't change its always the same person. I don't even like him as a boyfriend. So, is this normal or is this really not? :S