4 Dec The biological mechanism for how the metal causes homosexual actions is not totally understood, Frederick added. Mercury is a known endocrine disruptor—a substance that mimics or blocks the production of natural estrogen. In this case, exposed male birds' bodies produced more estrogen than. According to some studies, gay men have more older brothers on average, a phenomenon known as the fraternal birth order effect. It has been suggested that the greater the number of older male siblings the higher the level of androgen fetuses are exposed to. No evidence of birth order effects have been observed in . 18 Feb More and more people believe that gay sexuality is hereditary - but how does this idea fit with natural selection? For example, female foetuses exposed to higher levels of testosterone before birth show higher rates of lesbianism later on. Studies show that "butch" lesbian women and men have a smaller.
: Exposed gay natural
|BLACK ASS BODY||British sexcams|
|Hot pussys mas||795|
|Exposed gay natural||978|