Foreplay increases arousal and desire between partners. It also helps to lower inhibitions and increase emotional intimacy. Kissing, touching, oral sex, massage, and other sexual acts that don't bring either partner to climax may be considered part of foreplay.
More About Foreplay
Foreplay is a great way to get warmed up for more intense activities, but it's also an important way for couples to connect. Kissing, touching and other activities designed to bring pleasure - without the pressure of orgasm - are a valuable way for people to get to know each other, to relax with each other and to bond.