intercourse

Male circumcision reduces risk of HIV transmission from women to men

... of becoming HIV-infectedfollowing a single act of intercourse was calculated to be .0063, orone in 160. Uncircumcised men had a more than two-fold increased riskof infection per sexual act compared with circumcised men--one in 80versus one in 200. Past studies have also found greater HIV infectionrisk for uncir...

Sperm trading can resolve hermaphrodite mating conflicts

... with such a "cheating" partner interrupted sexual intercourse significantly sooner than did control pairs. This supports the concept of sperm trading, where mates negotiate mating roles in order to balance sexual interactions. ...

New HIV study identifies high-risk subgroups of adolescents

...rmining factors associated with unprotected sexual intercourse among adolescents is therefore critical to the development of appropriate and successful primary HIV/STI prevention interventions, the authors conclude. ...

Study challenges myth that sex late in pregnancy hastens birth

...nks the widely held belief that engaging in sexual intercourse during the final weeks of pregnancy can hasten lab...ts may continue to hear the 'old wives' tale' that intercourse will hasten labor, but according to this data, they should not hear it from the medical community," ...

Male circumcision reduces HIV risk, study stopped early

...es their risk of acquiring HIV during heterosexual intercourse by 53 percent. The study's independent Data Safety and Monitoring Board met Dec. 12 to review the interim data. Based on the board's review, the National Institutes of Health halted the trial and recommended that all men enrolled in the study who re...

Common parasitic infection leads to increased risk for HIV infection

...ow green discharge, and may feel discomfort during intercourse and urination, as well as itching of the genital area. Lower abdominal pain occurs in rare cases. The study, conducted by R. Scott McClelland, MD, MPH, and colleagues at the University of Washington in Seattle, the University of Nairobi, and the ...

Scientists sequence genome of parasite responsible for common sexually transmitted infection

... discharge, vaginal odor, discomfort during sexual intercourse and urination, irritation and itching of the genital area and, in rare cases, lower abdominal pain. In men, trichomoniasis is most common in the urethra; however, infected men often do not have symptoms. Those that do may experience irritation inside...