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Security 'bad news for sex drive'

Differences in sexual appetite may be driven by evolution

A woman's sex drive begins to plummet once she is in a secure relationship, according to research.

 Researchers from Germany found that four years into a relationship, less than half of 30-year-old women wanted regular sex.



Conversely, the team found a man's libido remained the same regardless of how long he had been in a relationship.
Writing in the journal Human Nature, the scientists said the differences resulted from how humans had evolved.



The researchers from Hamburg-Eppendorf University Hospital interviewed 530 men and women about their relationships.
They found 60% of 30-year-old women wanted sex "often" at the beginning of a relationship, but within four years of the relationship this figure fell to under 50%, and after 20 years it dropped to about 20%.



In contrast, they found the proportion of men wanting regular sex remained at between 60-80%, regardless of how long they had been in a relationship.



Tenderness

The study also revealed tenderness was important for women in a relationship.
About 90% of women wanted tenderness, regardless of how long they had been in a relationship, but only 25% of men who had been in a relationship for 10 years said they were still seeking tenderness from their partner.



Dr Dietrich Klusmann, lead author of the study and a psychologist from Hamburg-Eppendorf University Hospital, believed the differences were down to human evolution.
He said: "For men, a good reason their sexual motivation to remain constant would be to guard against being cuckolded by another male."



But women, he said, have evolved to have a high sex drive when they are initially in a relationship in order to form a "pair bond" with their partner.



But, once this bond is sealed a woman's sexual appetite declines, he added.
He said animal behaviour studies suggest this could be because females may be diverting their sexual interest towards other men, in order to secure the best combinations of genetic material for their offspring.



Or, he said, this could be because limiting sex may boost their partner's interest in it.
Professor George Fieldman, an evolutionary psychologist from Buckinghamshire Chilterns University College, said: "These findings seem to fit in with anecdotal studies and his explanations seem plausible.



"The rational for why a woman's sex drive declines may be down to supply and demand. If something is in infinite supply, the perceived value would drop."
BBC NEWS | Health | Security 'bad news for sex drive'

This was backed up by a big German study on sexuality. I read about therapist saying it is usually the men complaining about less sex. And I´ve seen that in my relationship as well.

Study suggests treatment for sex-drive deficiency

A study published in the May/June issue of the Journal of Sex and Marital Therapy found that bupropion hydrochloride sustained-release tablets may be an effective treatment for hypoactive sexual desire disorder (HSDD) in females, a deficiency or absence of sexual desire and fantasies for sexual activity.


The lead investigator for the study is R.Taylor Segraves, professor of psychiatry at CWRU's School of Medicine and chair of the Department of Psychiatry at MetroHealth Medical Center.


HSDD affects at least 20 percent of women in the United States. Currently, there is no approved drug treatment for HSDD and psychotherapy has proven minimally effective.
Study is on sex-drive deficiency

Is There a Gender Difference in Strength of Sex Drive? Theoretical Views, Conceptual Distinctions, and a Review of Relevant Evidence

Roy F. Baumeister Kathleen R. Catanese
Kathleen D. Vohs
Department of Psychology, Case Western Reserve University
The sex drive refers to the strength of sexual motivation. Across many different studies and measures, men have been shown to have more frequent and more intense sexual desires than women, as reflected in spontaneous thoughts about sex, frequency and variety of sexual fantasies, desired frequency of intercourse, desired number of partners, masturbation, liking for various sexual practices, willingness to forego sex, initiating versus refusing sex, making sacrifices for sex, and other measures. No contrary findings (indicating stronger sexual motivation among women) were found. Hence we conclude that the male sex drive is stronger than the female sex drive. The gender difference in sex drive should not be generalized to other constructs such as sexual or orgasmic capacity, enjoyment of sex, or extrinsically motivated sex.


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Is There a Gender Difference in Strength of Sex Drive? Theoretical Views, Conceptual Distinctions, and a Review of Relevant Evidence -- Baumeister et al. 5 (3): 242 -- Personality and Social Psychology Review

This seems to be very accurate and could be used as argumentation.

Sex Differences in Sex Drive, Sociosexuality, and Height across 53 Nations: Testing Evolutionary and Social Structural Theories.

Lippa RA.
Department of Psychology, California State University, Fullerton, Fullerton, CA, 92834, USA, rlippa@fullerton.edu.


By analyzing cross-cultural patterns in five parameters-sex differences, male and female trait means, male and female trait standard deviations-researchers can better test evolutionary and social structural models of sex differences. Five models of biological and social structural influence are presented that illustrate this proposal. Using data from 53 nations and from over 200,000 participants surveyed in a recent BBC Internet survey, I examined cross-cultural patterns in these five parameters for two sexual traits-sex drive and sociosexuality-and for height, a physical trait with a biologically based sex difference. Sex drive, sociosexuality, and height all showed consistent sex differences across nations (mean ds = .62, .74, and 1.63). Women were consistently more variable than men in sex drive (mean female to male variance ratio = 1.64). Gender equality and economic development tended to predict, across nations, sex differences in sociosexuality, but not sex differences in sex drive or height. Parameters for sociosexuality tended to vary across nations more than parameters for sex drive and height did. The results for sociosexuality were most consistent with a hybrid model-that both biological and social structural influences contribute to sex differences, whereas the results for sex drive and height were most consistent with a biological model-that evolved biological factors are the primary cause of sex differences. The model testing proposed here encourages evolutionary and social structural theorists to make more precise and nuanced predictions about the patterning of sex differences across cultures.
Sex Differences in Sex Drive, Sociosexuality, and ...[Arch Sex Behav. 2007] - PubMed Result

Can someone Translate the last one? I really don´t know what that means...