Teenage boys in Sweden take less responsibility than girls for preventing the spread of chlamydia and other sexually transmitted infections, according to a new study.

Medical tourism in Latin America needs to be regulated to protect consumers, according to researchers. A new study argues that Argentinean fertility clinics are increasingly marketing themselves to international health care consumers: these clinics offer all-inclusive packages with fixed prices that feature airfare, accommodations, transfers, language interpreters and, of course, fertility treatments.

Is it possible that the use of oral contraceptives is interfering with a woman's ability to choose, compete for and retain her preferred mate? A new paper reviews emerging evidence suggesting that contraceptive methods which alter a woman's natural hormonal cycles may have an underappreciated impact on choice of partners for both women and men and, possibly, reproductive success.

Researchers have identified the role of a gene in regulating molecular signals involved with ovarian follicle development, which may one day help shed light on some of the causes of fertility issues in humans.

Pre- and post-menopausal women who self-rated themselves as being sexually satisfied had a higher overall psychological well-being score and scores for "positive well-being" and "vitality," compared with sexually dissatisfied women in a study of 295 women sexually active more than twice a month. The study also uncovered a positive association between age and well-being, but a negative association for general health.

In the quest for speed, olympic swimmers shave themselves or squeeze into high-tech super-suits. In the body, sperm are the only cells that swim and, as speed is crucial to fertility, have developed their own ways to become exceptionally streamlined. Scientists in Europe have been studying the secrets of speedy sperm. Their work shows how a protein only found in developing sperm cells, Brdt, directs tight re-packaging of sperm DNA.