Like almost everything, it is likely to involve both genetic-physiological roots and cultural-learning roots. Here are some of the possible factors: First, there may be genetic foundations for homosexuality. Michael Bailey and Richard C. Homosexuals do have children, of course, but at a considerably lower rate than do heterosexuals. So why hasn't it "evolved out" of us?
Plasma basal levels of FSH, LH and testosterone in homosexual men.
PRIME PubMed | Plasma testosterone levels in homosexual me
University Of California, Berkeley Summary: The level of male hormones in the womb can influence an unborn child's future sexual orientation, according to new research from a University of California, Berkeley, professor who used an unusual technique - measuring finger length - to gather evidence. Breedlove looked at relative finger length because it is influenced by androgen levels in the womb and thus is an approximate measure of fetal androgen levels. Typically, in women, the two fingers of the right hand are nearly the same length. In men, the index finger is obviously shorter.
To preserve these articles as they originally appeared, The Times does not alter, edit or update them. Occasionally the digitization process introduces transcription errors or other problems; we are continuing to work to improve these archived versions. Researchers at the Masters and Johnson sex research in stitute in St. Louis have found that young men who are pre dominantly or exclusively homosexual generally have lower levels of the male sex hormone testosterone in their blood than do young hetero sexual men. The scientists said it could not be determined from the findings whether the hormone differences were a cause or an effect of homosexuality.
Menu Share Early experiences. Genetic modifications that respond to hormones in the womb may explain the development of homosexuality. Thinkstock By Elizabeth Norton Dec. It isn't the best way to pass along one's genes, and to complicate the picture further, no "gay genes" have even been identified.