Sounds hot to me! If my boy bit my nipple hard he'd have a stern talking to though... Bite me anywhere, just not my super sensitive bits!
But seriously, if you don't like it just tell him. He shouldn't be offended, you just like different things. Positive reinforcement is a really good idea too, don't just tell him what you dislike, make a point of telling him lots of stuff you really like that he does to you.
"You will always be loved, and you will always be in love with love... Don't be afraid. There are exquisite things in store for you. This is merely the beginning." - The Picture of Dorian Gray - Oscar Wilde.