A new review of studies shows fathers' attitudes toward teen sex and the emotional closeness of their relationships with their teens have a sizeable influence on their teens' sexual behaviors, separate from the influence of moms, Yahoo! News reports. The review showed that dads' attitudes toward teen sexual behavior were linked to the age at which teens first had sex. Teens whose dads approved of adolescent sexual activity tended to start having sex earlier than teens whose dads did not approve, according to studies in the review. In addition, teens who were close to their fathers tended to start having sex later. According to study researcher Vincent Guilamo-Ramos, a professor of social work at New York University, the findings "suggest that fathers may distinctly influence the sexual behavior of their adolescent children. Fathers may parent in ways that differ from mothers, and therefore represent an additional opportunity to support adolescent health and well-being."