Sexual desire involves both biology and psychology, can be unpredictable, and can manifest very differently in men and in women. For men, arousal typically precedes desire. But for women, desire often precedes arousal, in response to physical intimacy, emotional connection, and an atmosphere free of distraction.
Researchers focus on human desire by exploring the interplay of biological influences such as neurohormones and psychological influences such as emotions and relationships. Smell plays an often subtle role in attraction; research shows that women are attracted to mates whose natural body odor, or pheromones, signals a genetic profile distinct from their own.
Low sexual desire is common among both men and women but it can often be resolved by addressing conflicts, more consistently exchanging affection and conversation outside the bedroom, and making sufficient time for sex.
To learn more, see Sexual Attraction and Desire and How Men and Women Think About Sex.