News tagged with female sex
Men can rest easy -- sex chromosomes are here to stay
Fears that sex-linked chromosomes, such as the male Y chromosome, are doomed to extinction have been refuted in a new genetic study which examines the sex chromosomes of chickens.
May 08, 2012 |
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Sex-specific behaviors traced to hormone-controlled genes in the brain
Hormones shape our bodies, make us fertile, excite our most basic urges, and as scientists have known for years, they govern the behaviors that separate men from women. But how?
Feb 02, 2012 |
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Male spiders of one species lose their genitals after sex to increase sperm count in females
(PhysOrg.com) -- Researchers have known for some time that the male sex organ, called a palp, in orb-web spiders is often broken off during copulation with females; what hasn’t been so clear is why. ...
Feb 02, 2012 |
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Family composition determines success of great tit parents
Great tits who have as many sons as daughters acquire more grandchildren than great tits with an uneven family composition. That is because their children are reproductively more successful concludes NWO researcher Reinder ...
Dec 19, 2011 |
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High-energy lifestyles led to evolution of the sexes
Scientists are a step closer to explaining one of the most enduring mysteries of modern biology; why are there males and females?
Dec 19, 2011 |
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Elaborate plumage due to testosterone?
(PhysOrg.com) -- In many bird species males have a more elaborate plumage than females. This elaborate plumage is often used to signal body condition, to intimidate rivals or to attract potential mates. In ...
Oct 21, 2011 |
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Evolution keeps sex determination flexible
There are many old wives' tales about what determines a baby's sex, yet it is the tight controls at the gene level that determine an organism's sex in most species. Researchers at Michigan State University have found that ...
Sep 12, 2011 |
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Study: Extramarital sex and divorce more common among veterans
Veterans were significantly more likely to have ever engaged in extramarital sex and ever gotten divorced than people who were never in the military, according to new research to be presented at the 106th Annual Meeting of ...
Other Sciences / Social Sciences
Aug 22, 2011 |
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Needle sharing may play role in syphilis transmission
A binational team of researchers led by the University of California, San Diego School of Medicine has discovered that active syphilis infections are significantly greater in female sex workers who inject drugs and share ...
Medicine & Health / Diseases, Conditions, Syndromes
Apr 28, 2010 |
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Researcher compiles evidence in support of Darwin's theory of sexual selection
In 1871, Charles Darwin sparked debate that continues today when he proposed that human sex differences evolved based on sexual selection. Sexual selection is Darwin's theory that certain physical, mental or psychological ...
Apr 13, 2010 |
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What's eating the breadwinners?
Control, independence, ambition, pressure, worry, guilt and resentment are all experienced by female breadwinners, according to Dr. Rebecca Meisenbach from the University of Missouri in Columbia, USA. Dr. Meisenbach explored ...
Medicine & Health / Psychology & Psychiatry
Nov 18, 2009 |
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Placental precursor stem cells require testosterone-free environment to survive
Trophoblast stem cells (TSCs), cells found in the layer of peripheral embryonic stem cells from which the placenta is formed, are thought to exhibit "immune privilege" that aids cell survivability and is potentially beneficial ...
Oct 29, 2009 |
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Fruit fly sperm makes females do housework after sex
The sperm of male fruit flies are coated with a chemical 'sex peptide' which inhibits the female's usual afternoon siesta and compels her into an intense period of foraging activity.
Sep 30, 2009 |
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Boy or girl? In lizards, egg size matters
Whether baby lizards will turn out to be male or female is a more complicated question than scientists would have ever guessed, according to a new report published online on June 4th in Current Biology. The study shows that f ...
Jun 04, 2009 |
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Spanish prostitutes least likely to use condoms
The Centre for Epidemiological Studies into Sexually-Transmitted Diseases and AIDS in Catalonia (CEEISCAT) started a pioneering study in Spain in 2005 to look into the prevalence of sexually-transmitted diseases (STDs) among ...
May 28, 2009 |
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