As I said on Orich's thread once, half jokingly, "Can a guy just give me a back rub without it leading to ML?" The guys pretty much said "NO WE CAN"T! We are men..."
Touching between spouses tends to lead to that.
Can a guy (I'm assuming your husband) give you a backrub without it leading to ML?
Yes.
Can your husband just have sex with you without having to give you a backrub?
Maybe he's been trained to believe that you won't give him sex any other way unless he does something for you. Maybe he feels thats the only way he can get some from you? Maybe/maybe not?