well lots of girls do, but not all obviously.
and it depends what you mean by rough - i mean there's levels - such as just very very energetic, then bit of hair pulling, spanking and scratching, to actual pain, like slapping - then extremes like s&m and simulated rape etc
he has probably been watching too much porn or talking to an idiot mate.
i had a boyfriend a bit like this - never had a girl before and had all sorts of unrealistic ideas about how they were - i soon taught him the truth
are you young?
if you are teens i'd say he just needs to learn the truth and not listen to mates and films