jueves, 8 de octubre de 2009

Anovulatorios y selección de pareja sexual

Que el uso de Anovulatorios altera la líbido es algo ya conocido y explicado.

También es conocida y explicada la fase de "celo" que se experimenta de forma periovulatoria,... en el fondo somos muy parecidos a los animales. Es por tanto que no debe de sorprender ni escandalizar a nadie los hallazgos de esta revisión de la literatura que acaban de publicar en Trends in Ecology and Evolution que indica que durante la fase periovulatoria, las mujeres instintivamente nos fijamos más en hombres con características más maculinas y algo de "macho alfa". Si una mujer no ovula o toma anovulatorios durante largos periodos, sus gustos en cuanto a la elección de la pareja sexual (o el rollete del sábado noche) se asemajan más a los de la primera fase del ciclo: hombres con menos características de macho alfa. Como somos millones las mujeres que tomamos anovulatorios en todo el mundo podemos concluir que el macho ibérico puede entrar en vías de extinción.

Sin embargo si nos paramos a reflexionar... no parece tan claro que se nos vaya a extinguir el macho ibérico. Ya que como hemos dicho, las que ovulan, las que pueden quedarse preñadas los prefieren viriles :)

(si , ya sé, reflexiones baratas, luego entran en juego muchos factores psicológicos etc)

Dejo un artículo que resume el paper antes comentado (cuando consiga el paper, si merece la pena lo colgaré)

There is no doubt that modern contraception has enabled women to have unprecedented control over their own fertility. However, 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 published by Cell Press in the October issue of the journal Trends in Ecology and Evolution 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.

Human females are only fertile for a brief period during their menstrual cycle, just prior to ovulation. Many scientific studies have established that partner preferences of both women and men vary significantly according to predictable hormonal fluctuations associated with the natural menstrual cycle. Ovulation is associated with a profound shift in some female physical characteristics, behaviors and perceptions related to mate attraction.

Ovulating women exhibit a preference for more masculine male features, are particularly attracted to men showing dominance and male-male competitiveness and prefer partners that are genetically dissimilar to themselves. This is significant because there is evidence suggesting that genetic similarity between couples might be linked with infertility. Further, some studies have suggested that men detect women's fertility status, preferring ovulating women in situations where they can compare the attractiveness of different women.

The oral contraceptive pill alters the hormonal fluctuations associated with the menstrual cycle and essentially mimics the more steady hormonal conditions associated with pregnancy. "Although mate choice studies in humans have routinely recorded pill use during the last decade to control for its confounding effects, little effort has been invested in understanding the consequences of such effects of the pill," offers study author Dr. Alexandra Alvergne from the Department of Animal and Plant Sciences at the University of Sheffield.

Dr. Alverne and colleague Dr. Virpi Lumma reviewed and discussed new research supporting the conclusion that use of the pill by women disrupted their variation in mate preferences across their menstrual cycle. The authors also speculate that the use of oral contraceptives may influence a woman's ability to attract a mate by reducing attractiveness to men, thereby disrupting her ability to compete with normally cycling women for access to mate.

Of particular interest is the fact that women taking the pill do not exhibit the ovulation-specific attraction to genetically dissimilar partners. "The ultimate outstanding evolutionary question concerns whether the use of oral contraceptives when making mating decisions can have long-term consequences on the ability of couples to reproduce," suggests Dr. Lummaa.

Taken together, an increasing number of studies suggest that the pill is likely to have an impact on human mating decisions and subsequent reproduction. "If this is the case, pill use will have implications for both current and future generations, and we hope that our review will stimulate further research on this question," concludes Dr. Lummaa.

Alvergne et al.: "Does the contraceptive pill alter mate choice in humans?'"