They have found that people with a certain genetic make-up have a much stronger sex drive than others. The remarkable finding could go some way to explaining the behaviour of self-confessed 'sex addicts' such as Michael Douglas. It could also help provide reassurance for those who are perfectly happy with their relatively low libido, but are made to think they are abnormal because magazines, television and films suggest most people having sex all the time. The new research centres on a gene called D4, which is involved in the brain's reaction to the pleasure chemical dopamine. It included questions such as whether they felt aroused when they saw a steamy scene in a film, how often they made love and the frequency that they thought about sex.
Disgusted by incest? Genetic Sexual Attraction is real and on the rise
Sexual Desire Disorders – Sexual Addiction
While the genetic basis of these differences is unknown and while such variations are obscured by conditioning, there is no doubt that sexual capacities, like all other physiological capacities, are genetically determined. It is unlikely, however, that genes control the sexual orientation of normal humans in the sense of individuals being predestined to become homosexual or heterosexual. Some severe genetic abnormality can, of course, profoundly affect intelligence, sexual capacity , and physical appearance and hence the entire sexual life. While the normal female has 44 autosomes plus two X-chromosomes female and the normal male 44 autosomes plus one X-chromosome and one Y-chromosome male , many genetic abnormalities are possible. While a disorder of any part of the endocrine system can adversely affect sexual life, the hormones most directly influencing sexuality are the androgens male sex hormones , produced chiefly in the testicles , and the estrogens female sex hormones , produced chiefly in the ovaries.
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Questions & Answers: Is addiction hereditary?
Some inherit a high libido from their ancestors, which makes them burn with desire every day. Some need sex only once a week, whereas others do not feel the need in sex at all and can be happy with Platonic love. Libido may vary depending on circumstances.
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Promiscuity tends to be frowned upon by many societies, expecting most members to have committed, long-term relationships with single partners. Most societies have historically been more critical of women's promiscuity than of heterosexual men's. Among women, as well as men, inclination for sex outside committed relationships is correlated with a high libido ,  but social and cultural factors have also been observed to influence sexual behavior and opinion. Studies have related sociosexual orientation to sex drive , especially in women, where the higher the sex drive the less restricted the sociosexual orientation, or interest in sex outside committed relationships.