The chart above is from Religion and Sexual Behaviors: Understanding the Influence of Islamic Cultures and Religious Affiliation for Explaining Sex Outside of Marriage. It seems that Jews are more likely than any other monotheists to report having premarital sex. The paper also reports (p. 739) that married Jews are more likely than married people in other major religious groups to report having extramarital sex.
Does this mean Jews have more premarital sex, and commit more adultery, than people of other religions--or is it just that Jews are more likely to admit these behaviors to a researcher? Either way, what does that say about Jewish communities?