
The Old Testament, like most codes of early civilization, forbids adultery, but it means by adultery intercourse with a married woman. This is evident to anyone who reads the Old Testament attentively. .. St. Paul's view were emphasized and exaggerated by the early Church; celibacy was considered holy, and men retired into the desert to wrestle with Satan while he filled their imaginations with lustful visions.
Source: Bertrand Russell :Marriage and Morals, 1929
More info.: https://russell-j.com/beginner/MM05-030.HTM