Because your concern should be for their education.

It is, but China is not the UK. My concern for them is within the confines of the chinese education system and their values, not yours. Chinese professors date their students while they are teaching them, but I do not do that. You have selective reading skills it would seem, EX student see, like EX girlfriend and so on. Meaning not my student now, at present, this moment in time. A former student, not a current student. [edited]

You are there to teach them, not groom them.

Right, and teach them I do. Groom implies peadophilia, a serious statement from you btw.

I am far from a prude.

Fair enough.