Christians and traditional beliefs about sex and abortion are often influenced by religious teachings and moral values. In Christianity, the belief that sex should only occur within the confines of marriage is based on biblical teachings that emphasize the sanctity of marriage and the importance of sexual purity. Additionally, many Christians believe that life begins at conception and that abortion is a violation of the sanctity of life.
One possible reference for this topic could be:
Smith, J. (2018). Christian beliefs about sex and abortion. Journal of Religion and Ethics, 42(3), 345-362.