Libido /lɨˈbiːdoʊ/, or colloquially sex drive, is a person's overall sexual drive or desire for sexual activity. Sex drive is determined by biological, psychological, and social factors. Biologically, levels of hormones such as testosterone are believed to affect sex drive; social factors, such as work and family, also have an impact; as do internal psychological factors, like personality and stress. Sex drive may be affected by medical conditions, medications, lifestyle and relationship issues. A person who has extremely frequent or a suddenly increased sex drive may be experiencing hypersexuality. Hypersexuality is extremely frequent or suddenly increased sexual urges or sexual activity. Although hypersexuality can be caused by some medical conditions or medications, in most cases the cause is unknown. Mental health problems such as bipolar disorders can give rise to hypersexuality,^[1]and alcohol and some drugs can affect social and sexual inhibitions in some people.