mustang: Foreplay is an integral part of any sexual experience. According to a lecture in "Lifespan Sexuality," the excitement phase, or the stage synonymous with foreplay, is one of the longest f four phases of the human sexual response cycle.

Arousal occurs from both physical and visual stimulation, from activities such as touching, being touched, dry humping, oral sex, or even just an active imagination and good visual of your partner's ass.

With an adequate amount of warming up, not only will your body actually heat up temperature-wise, but there will also be other physical responses.

A woman's vagina will start lubricating and become larger and more elastic, and a male will gain a full erection. Both sexes often have erect nipples, a faster heart rate, and quicker breathing during this stage.