Well you're going to find extremes so it will be a topic. My master took up with one of the students in 1977. That was the only time I know of and they lived together a couple years, so it wasn't like "tagging".
Of course western ethics says no. I have noticed tho that buddhists aren't celibate and often have more eastern ideas, but I don't know if there even is an official policy?
But as a "spur posse", bagging 'em thing of course it's gross. Look at the guys doing it.
That doesn't mean you will hear much talking about it because of the large number of ma's you will find that aren't opposed and will when they can.
"The perfect way to do, is to be" ~ Lao Tzu