Originally Posted by Neapolitan

Catechism 2356 "Rape is the forcible violation of the sexual intimacy of another person. It does injury to justice and charity. Rape deeply wounds the respect, freedom, and physical and moral integrity to which every person has a right. It causes grave damage that can mark the victim for life. It is always an intrinsically evil act. Graver still is the rape of children committed by parents (incest) or those responsible for the education of the children entrusted to them."

Not only rape is wrong wrong, but also lust, which is a desire that precedes it.

"But I say to you, that whosoever shall look on a woman to lust after her, hath already committed adultery with her in his heart." -- Matthew 5:28

"You shall not covet your neighbor's wife ..."
— Exodus 20:17