tbh, it can be as sex crazed as you want it to be! I mean, the opportunities are likely to be there, but its up to you if you want to take them.
There is no generalisation about this. There will people who will sleep around, and those who don't have sex at all, for what ever reason.Most people are somewhere in the middle. I came to uni a virgin, and really shy, not even considering the possibilty of sex really. But then I met my bf, lost my virginity to him, and we've been together a year.
so just be mature about it, and don't let anyone but you decide how much sex you have!