So far, it seems that the charges stem solely from communicating with a student outside of class. Surely, that communication was sexually charged, but "rape" wouldn't seem to apply.

when its an attractive white female, its always slept with, or relationship.

Isn't it typical for the "lowest" or most certain charge to be charged initially, with additional charges filed later?

I think teachers are not like cops in that regard. I have a friend who got accused of hitting a young student (immediate suspension with “investigation” pending for months and not going anywhere over whether the event actually happened or not) and they are not succeeding at finding any new job.