I suspect that the English "rape" has its roots in the Latin "rapio", which is very much not about sexual conduct--though the meaning clearly could be mutated over time (as it seems to have been) to mean forced intercourse.

http://en.wiktionary.org/wiki/rapio

EDIT: For a further stack trace, consider "enrapture", derived from "rapture", itself derived from the future form of "rapio": http://en.wiktionary.org/wiki/rapture .

And people say that a classical education and liberal arts is useless. :)