1. LeVay, Simon, "A Difference in Hypothalamic Structure Between Heterosexual and Homosexual Men, Science, Volume 253: 1034-1037
2. Hamer, Dean, Hu, Stella et al. "A Linkage Between DNA Markers on the X Chromosome and Male Sexual Orientation", Science, Volume 261, July 16, 1993: 321-327.
3. Bailey, J.M. and Pillard, R.C. "A genetic study of male sexual orientation", American Journal of Psychiatry,150(2):272-277, 1993.
The first two studies have not been replicated and have serious methodological flaws. There is another gene study that is supposed to come out this year. The third researcher, Dr. Bailey was indicted for engaging in fraud and so his research has been questioned but again not by anyone outside of scientific circles. There are additional twin studies but they found lower than the 50% that Bailey found of identical twins exhibiting same gender attraction. Still only half of identical twins shared a homosexual attraction indicating that there is something else going on in the expression of same gender behavior.
There are a few organizations and or scientists who have been brave enough to present other interpretations for the data being reported by the mainstream media.
The first and third articles listed on the side bar are by Dr. Jeffrey Satinover and provide an easy to read explanation of genetic research.
Here is an additional link of a video showing three marriage and family researchers discussing concerns regarding same gender marriage. http://link.brightcove.com/services/link/bcpid1847329084/bctid1825879383
Listed below are three organizations dedicated to helping individuals and families dealing with same gender issues. They are excellent resources of information, research, treatment options, support groups, etc.
Byne, Willliam. "Why We Cannot Conclude That Sexual Orientation Is Primarily a Biological Phenomonen", Journal of Homosexuality, Vol.34(1);73-80,1997.
One last article on a different way to view the data .
Happy reading and viewing!