Here in Canada professors will have relationships with students. Usually it happens after the course work is done but, I've heard of it during too. I don't know if it is scandalous but, no one really seems to care when it's gossiped about. University students are adults and can make their choices.

Never even crossed my mind about the grades. Maybe it's because I was in Arts and social sciences and grades are seen as arbitrary measures secondary to subject matter and we know, unless you're planning on grad school no one cares what your gpa was when you have a BA. Heck, few employers could care about your BA at all. That isn't why you're there and C's get degrees even some Ds will get you there but really, if you can't get an A in the arts when you want one, you really should not be in university.