From ArticleWorld

Foreplay is a mutual physical intimacy and sex stimulation preceding sexual intercourse that is used to build up sexual arousal. It can also be used for pure sexual enjoyment or to reach an orgasm. Types and styles of foreplay vary different between cultures, and different acts are practiced in different parts of the world. Foreplay is not a necessary part of sexual activities, but more of a personal preference. Partners can engage in foreplay as long as they want, there is no time limit.

Examples of Foreplay