Sexual activity in humans is an instinctive form of physical intimacy. It may be performed for the purposes of biological reproduction, spiritual transcendence, expressing affection, and/or having fun and enjoying oneself (known in this context as "sexual gratification"). The desire to have sex is one of the basic drives of human behavior. Every sexually-reproductive animal species, and every human culture, has a range of conduct used in courtship, intimacy, and sexual activity.

Human sexual behaviour is therefore the behaviors that human beings use when seeking sexual or relational partners, gaining approval of possible partners, forming relationships, showing affection, and mating