News tagged with sex
The most common inherited form of mental retardation and autism, fragile X syndrome, turns some brain cells into chatterboxes, scientists at Washington University School of Medicine in St. Louis report.
Neuroscience Feb 20, 2013 | 4.8 / 5 (4) | 1 |
Since 1977, there has been a 70% increase in caffeine consumption among children and adolescents. Whether it is coffee, tea, soda, or energy drinks, our children are consuming more of it. One well documented effect of caffeine ...
Health Apr 22, 2013 | 3.5 / 5 (2) | 0
Teenagers are risk-takers—they're more likely than children or adults to experiment with illicit substances, have unprotected sex, and drive recklessly. But research shows that teenagers have the knowledge and ability to ...
Psychology & Psychiatry Apr 17, 2013 | 5 / 5 (1) | 0 |
The eternal question of whether penis size matters to women has been probed by a team of international scientists who reported on Monday that yes, ladies do find larger men more attractive.
Psychology & Psychiatry Apr 08, 2013 | 3.6 / 5 (22) | 23
A proof-of-concept study suggests the possibility of engineering artificial ovaries in the lab to provide a more natural option for hormone replacement therapy for women. In Biomaterials, a team from Wake Forest Baptist Medica ...
Medical research Mar 26, 2013 | 5 / 5 (3) | 0 |
(Medical Xpress)—For a bunch of inanimate chemical compounds, the nucleic and amino acids caught up in the infamous "selfish" segregation distorter (SD) saga have put on quite a soap opera for biologists ...
Genetics Mar 05, 2013 | 5 / 5 (1) | 0 |
Male rat pups have more of a specific brain protein associated with language development than females, according to a study published February 20 in The Journal of Neuroscience. The study also found sex differences in the ...
Neuroscience Feb 19, 2013 | 5 / 5 (1) | 0 |
The more sex partners young adults have the more likely they are to go on to develop alcohol or cannabis dependence disorders in young adulthood, according to new University of Otago research.
Psychology & Psychiatry Feb 15, 2013 | 3.8 / 5 (5) | 1 |
Research published today in the Australian and New Zealand Journal of Public Health has found that many secondary school students regret having sex after drinking too much alcohol.
Addiction Feb 13, 2013 | 1 / 5 (1) | 1 |
Women who outnumber men in poor communities are likelier to have babies at a younger age as competition drives them to lower their expectations of the opposite sex, a study said on Wednesday.
Psychology & Psychiatry Feb 13, 2013 | not rated yet | 1
For decades, popular writers have entertained readers with the premise that men and women are so psychologically dissimilar they could hail from entirely different planets. But a new study shows that it's time for the Mars/Venus theories about the sexes to come back to Earth. ...
Psychology & Psychiatry Feb 04, 2013 | 3.1 / 5 (14) | 15 |
(Medical Xpress)—The 1950s were not as prudish as they seemed on the surface, says economist Andrew Francis.
Health Jan 28, 2013 | 5 / 5 (7) | 1 |
(Medical Xpress)—Research on the communication trait of verbal aggressiveness, which includes behavior like name calling, ridicule, insults, racial epithets and threats, has tended to focus on its social ...
Psychology & Psychiatry Jan 07, 2013 | 3.2 / 5 (9) | 2 |
Johns Hopkins scientists have found a surprising mechanism that gives male sex hormones like testosterone control over the gender-specific absence or presence of mammary gland nerves that sense the amount ...
Medical research Dec 06, 2012 | 4 / 5 (2) | 0 |
Women suffering from sleep apnea have, on the whole, a higher degree of brain damage than men with the disorder, according to a first-of-its-kind study conducted by researchers at the UCLA School of Nursing. The findings ...
Sleep apnea Dec 03, 2012 | not rated yet | 0 |
In biology, sex is a process of combining and mixing genetic traits, often resulting in the specialization of organisms into male and female types (or sexes). Sexual reproduction involves combining specialized cells (gametes) to form offspring that inherit traits from both parents. Gametes can be identical in form and function (known as isogametes), but in many cases an asymmetry has evolved such that two sex-specific types of gametes (heterogametes) exist: male gametes are small, motile, and optimized to transport their genetic information over a distance, while female gametes are large, non-motile and contain the nutrients necessary for the early development of the young organism.
An organism's sex is defined by the gametes it produces: males produce male gametes (spermatozoa, or sperm) while females produce female gametes (ova, or egg cells); individual organisms which produce both male and female gametes are termed hermaphroditic. Frequently, physical differences are associated with the different sexes of an organism; these sexual dimorphisms can reflect the different reproductive pressures the sexes experience.
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