As requested by Zirconia Wolf, lecherous sims no longer exist once you've installed this patch. Obviously this mod requires UNI, since without that there ARE no lechers.
I think maybe they're supposed to be creepy in an odd sort of way, and that the students are supposed to get this and not like them for it. They're more amusing than irritating, so I'm not sure I'd really want to fix this.
And if you like this odd behavior, then please, feel free to NOT download this mod. But in time you'll change your mind, because this weirdness gets old in a hurry