[gavanwoolery]

As with most positions of power, I am certain there is some abuse, although in some cases it can also be mutual attraction (probably more rare). I recall in my college that students "frequently hooked up" with their TAs, (whether or not this was a myth, I do not know).

[SantalBlush]

That is correct; some romantic relationships exist in a workplace. A lot of married professors even work at the same university.