Yeah, we were like that for the first year or so. We probably went at it 6-7 times a day. I was an RA and had to be "on call" one night a week...what else was I going to do?
By the time junior year rolled around, we each had these wonderful things called lives. And classes that actually mattered.
As their relationship matures, they'll calm down. Especially if it's the first relationship (and for some reason I just think it is). They can't get enough of eachother--and they don't know if the sex is bad or not!
Call me a cynic, but I'm willing to put money on the marriage either not happening at all, or self-destructing within 3 years.