Navigation Links
Genetics, Environment Shape Sexual Behavior
Date:6/30/2008

There's likely no one key reason for a particular orientation, research shows

MONDAY, June 30 (HealthDay News) -- Genetics and random environmental factors each play a major role in determining both gay and heterosexual behavior, say British and Swedish researchers.

"This study puts cold water on any concerns that we are looking for a single 'gay gene' or a single environmental variable which could be used to 'select out' homosexuality -- the factors which influence sexual orientation are complex. And we are not simply talking about homosexuality here -- heterosexual behavior is also influenced by a mixture of genetic and environmental factors," study co-author Dr. Qazi Rahman, a leading scientist on human sexual orientation, said in a prepared statement.

Environmental factors are specific to an individual and may include biological processes such as different hormone exposure in the womb, the researchers noted.

The researchers studied more than 3,800 same-gender twin pairs, ages 20 to 47, in Sweden. The twins were asked about the total numbers of opposite sex and same sex partners they had ever had.

"Overall, genetics accounted for around 35 percent of the differences between men in homosexual behavior and other individual-specific environmental factors (that is, not societal attitudes, family or parenting which are shared be twins) accounted for around 64 percent. In other words, men become gay or straight because of different developmental pathways, not just one pathway," Rahman said.

Among the female twins, genetics explained about 18 percent of the variation in sexual orientation, non-shared environmental factors 64 percent, and family environment 16 percent.

It's important to note that heredity and shared environment had roughly the same influence in women, while shared environment had virtually no impact on men's sexual behavior, the researchers said.

The study, which was published in the journal Archives of Sexual Behavior, shows that while genetic factors are important, non-shared environmental factors are dominant in determining sexual orientation.

"This study is not without its limitations -- we used a behavioral measure of sexual orientation which might be okay to use for men (men's psychological orientation, sexual behavior, and sexual responses are highly related) but less so for women (who show a clearer separation between these elements of sexuality)," Rahman noted. "Despite this, our study provides the most unbiased estimates presented so far of genetic and non-genetic contributions to sexual orientation."

More information

The American Psychological Association has more about sexual orientation.



-- Robert Preidt



SOURCE: University of London, news release, June 28, 2008


'/>"/>
Copyright©2008 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Interleukin Genetics, Inc. Management to Present at Healthcare Conferences
2. Environmental stress probed in cardiovascular disease, diabetes
3. Dow Jones Sustainability Index Again Recognizes Abbott for Continued Leadership in Business, Environmental and Social Performance
4. GladRags Introduces the Moon Cup - An Environmentally-Sound and Safe Alternative to Disposable Feminine Hygiene Products!
5. Environment, Energy and Ethics conference at UD, Sept. 21-23
6. Blue Cross and Blue Shield Association Nationally Recognized by BusinessWeek and AARP for Creating a Unique Workplace Environment for New and Mature Employees
7. Green Seal Ramps Up Environmental Standard for Household Cleaners
8. Siemens Building Technologies Pioneers Wireless Solution for St. Anthonys Sensitive Environment
9. ADA Updates Environmental Recommendations for Handling Waste
10. Statement by Gerald Leape, Vice President, Marine Conservation, National Environmental Trust, on a New Recommendation From Scientists Urging Pregnant Women to Eat More Fish
11. PointCross Releases Pre-Clinical Study Lifecycle and Data Management Suite (PC-LDM(TM)) For Multi-Party Environments
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:5/24/2017)... Utah (PRWEB) , ... May 24, 2017 , ... ... Sick Kids: The Surprising Truth about Pediatric Septic Shock” hosted by the Journal of ... 2017, at 2 p.m. Eastern time, will be presented by Captain Rommie Duckworth, LP, ...
(Date:5/24/2017)... ... ... thinking of a visit to San Francisco , fall is a great time to ... , Business Architecture Associates is pleased to offer 5 days of training courses, available to ... for individuals, and as 4-½ day corporate package for up to 3 employees with the ...
(Date:5/24/2017)... ... ... Lowe is a sought after actor, and also serves as the host of the ... all aspects of life, and a new segment is being developed on podiatry, which ... is essential to people’s overall well-being, and if viewers have feet problems, they may ...
(Date:5/24/2017)... ... 24, 2017 , ... Fiberstar, Inc., http://www.FiberstarIngredients.com a ... beverage industry offers Citri-Fi®, a natural citrus fiber, to improve beverage ingredient declarations. ... a result, labels need to deliver simple, transparent and clear messaging. Listed food ...
(Date:5/24/2017)... ... May 24, 2017 , ... Dymedix® Diagnostics, Inc., ... announced today it had completed the first phase of building a global distribution ... rest of world (ROW) authorized dealers specializing in polysomnography accessories. The company ...
Breaking Medicine News(10 mins):
(Date:5/8/2017)... 8, 2017  Diplomat Pharmacy, Inc. (NYSE: DPLO)., has ... ("WRB"), a health care service center company based in ... specializes in relationship management programs for leading pharmaceutical manufacturers ... WRB will join Envoy Health Management, ... for manufacturers, biotech firms, and other service companies. Together, ...
(Date:5/4/2017)... -- Fortuna Fix Inc. (" Fortuna "), a private, clinical-stage ... the need for embryonic and fetal stem cells by using ... Fortuna announced today the launch of its ... MD, PhD; Father Kevin FitzGerald , S.J., PhD; Col. ... James Giordano , PhD. "We are excited and ...
(Date:5/4/2017)...  DarioHealth Corp. (NASDAQ: DRIO), a leading global digital ... today announced that it is teaming up with Auto ... to lower diabetes healthcare costs in Canada ... is available throughout all provinces and territories in ... for additional savings when shopping for Dario supplies in ...
Breaking Medicine Technology: