(Human) Sexual behavior refers to a broad spectrum of behaviors in which humans display their sexuality. These behavioral expressions contains both biological elements and cultural influences and involves sexual arousal (with its physiological changes, both pronounced and subtle, in the aroused person). Sexual behavior ranges from the solitary (such as masturbation and autoerotic stimulation) to partnered sex (intercourse, oral sex, non-penetrative sex, etc.) that is engaged in periodically. Sexual behavior can also involve behavior that is aimed at arousing desire in potential partners (courtship displays or rituals) or behavior aimed at enhancing sexual experiences (foreplay, BDSM, etc.).