So is rape reeeally wrong?

[GrandizerII]

There is no absolutely objective basis for why rape is wrong (although some atheists may argue there is some form of objective basis), but that doesn't matter either way. Excluding psychopaths, sociopaths, and the like, we are generally conditioned to oppose rape and see it as really wrong. So that's good enough reason to see it as such. Knowing the exact reason(s) only matters for the purpose of knowing why, but it is not a requirement for making such a moral judgement.