some excellent advises, each with its' own weight...
we all condone this behavior and must prevent it at whatever cost, however, i suggest you first send some wazees to this dude with a strong word of caution that whatever he is pretending to do is not only immoral but criminal and that should he fail to hold himself back you will take a more severe action against him..
in-case he refrain well, you let him go scot-free otherwise, go king, guka's & muchknow's way...
When you hear what I say, you will not understand. When you see what I do, you will not comprehend