Raping A Woman Is Like Taking Away Her Happiness

Rape is taking away another person's natural right to liberty and pursuit of happiness. Everyone is entitled to those natural rights, thus it is considered morally "wrong" by most. Generally,You wouldn't want someone to take away your liberty though, would you?

Rape is nothing but emotional and physical torture. Because humans are sentient beings, they are able to recognize pain as undesirable. Because we can recognize ourselves and others as humans, we know that rules that apply to us will also apply to others. Pain is undesirable to me, so it must be to others. Rape is meant to harm, so when a person experiences it or views it, they know that the victim is feeling pain, and anybody who does not want to cause others pain will recognize rape as bad.

What defines something as right or wrong generally follows the rule that something right is something overall beneficial, while something wrong is harmful to people or society. Murder will usually bring down society, because it removes one of its members. Something that is wrong is just something that is counter-productive, and usually something done for personal greedy purposes. Meant to make oneself feel better, even at the expense of others.

Because we, as humans, are able to tell whether something is right or wrong by the fact that it either helps or hurts overall, we can conclude that rape is wrong because it is an action that purposefully causes pain. (Not wrong as in incorrect, but wrong as in bad)