In human sexual behavior, foreplay is a set of emotionally and physically intimate acts between two or more people meant to create sexual arousal and desire for sexual activity. Either or any of the sexual partners may indicate sexual interest to initiate foreplay, and the initiator may not be the active partner during the sexual activity. Foreplay stimulates both partners' sexuality, lowers inhibitions and increases emotional intimacy between partners, and implies a certain level of confidence and trust between the partners. In animal sexual behavior, the loose equivalent is sometimes termed 'precoital activity'.
Sexual desire is an aspect of a person's sexuality, which varies from one person to another. A person who desires sexual activity with another person can provoke sexual arousal in the person. Depending on the type and intensity of the relationship between the two people, the stimuli may involve indicating to the person in some subtle and romantic way that he or she has that desire or by provoking other erotic stimuli. There are many potential stimuli, both physical, and/or mental which can cause a person to become sexually aroused, and which stimuli are invoked will depend on circumstances at a particular time.
On the other hand, there are other things which act as turn-offs, depending on the person's preferences. The response to an indication of sexual interest may be inhibited by issues of sexual morality.