Extremely high labido

I am in my first real long term relationship- this includes a sexual relationship. I have never been this in love/attracted to someone. We are in somewhat of a long distance relationship as he lives an hour and a half away at a different college than me. I'm a very sexual woman, I love sex and enjoy pleasing my partner. Always have. Ever since my boyfriend has returned to our hometown for Christmas break my sex drive has been through the roof. I can't keep my hands (or lips) off of my man and we end up having sex at least twice a day. Is this normal? What could be causing this?