Sexual repression in the West was mainly rooted in religion. From a religious point of view, the main purpose of the human sex act is reproduction. Thus sexual activity outside the institution of marriage is regarded as "sinful."
西方的性壓抑主要來自宗教，以宗教的眼光來看，人類性行為的首要目的是為了繁衍後代，因此婚姻制度外的性行為會被視為一種「罪過」。