Changes in the sexual desires of any partner in a sexual relationship, if sustained and unresolved, may cause problems in the relationship.

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Sexual desires are often an important factor in the formation and maintenance of intimate relationships in humans.

A lack or loss of sexual desire can adversely affect relationships.

), colloquially known as sex drive, is a person's overall sexual drive or desire for sexual activity.

Sex drive is influenced by biological, psychological and social factors.

Biologically, the sex hormones and associated neurotransmitters that act upon the nucleus accumbens (primarily testosterone and dopamine, respectively) regulate libido in humans.

Social factors, such as work and family, and internal psychological factors, like personality and stress, can affect libido.Sex drive can also be affected by medical conditions, medications, lifestyle and relationship issues, and age (e.g., puberty).A person who has extremely frequent or a suddenly increased sex drive may be experiencing hypersexuality, while the opposite condition is hyposexuality.Problems can arise from disparity of sexual desires between partners, or poor communication between partners of sexual needs and preferences.It is the instinct energy or force, contained in what Freud called the id, the strictly unconscious structure of the psyche.On the other hand, a person can engage in sexual activity without an actual desire for it.