Sexual desire refers to an individual's longing or craving for sexual activity. It is a complex and multifaceted concept that involves both physical and emotional components, including hormonal influences, psychological factors, and social conditioning. Sexual desire can be influenced by various factors such as arousal, attraction, and relationship dynamics. The level of sexual desire may vary over time and across different stages of life, and it is essential to recognize that there is a wide range of "normal" levels of sexual desire among individuals.