Resources and evidence on the science of homosexuality

Twin studies for male homosexuality:
http://www.tim-taylor.com/papers/twin_studies/studies.html
http://allpsych.com/journal/homosexuality.html
http://www.springerlink.com/content/w27453600k586276/
See: http://tinyurl.com/yl2rurn for the PDF.

Fraternal birth order effect on sexual orientation:
http://www.pnas.org/content/103/28/10771.full.pdf
https://www.msu.edu/~breedsm/pdf/BogaertCommentary2006.pdf

Why Reparative Therapy and Ex-Gay Ministries Fail
http://www.csufresno.edu/StudentOrgs/usp/resources/flyers/missionimpossible.htm

American Medical Association on Homosexuality
http://www.clgs.org/official-statement-concerning-homosexuality-american-medical-association

American Psychiatric Association on Homosexuality
http://www.soulforce.org/article/642

American Psychological Association on Homosexuality
http://www.apa.org/topics/sexuality/index.aspx
http://www.apa.org/helpcenter/sexual-orientation.aspx

American Psychoanalytic Association on Homosexuality
http://hem.passagen.se/nicb/psychoanalysis.htm

American Academy of Pediatrics on Homosexuality
http://www.clgs.org/official-statement-concerning-homosexuality-american-academy-pediatrics

National Association of Social Workers on Homosexuality
http://www.socialworkers.org/research/naswResearch/substanceAbuse/LGBT/LGBT.asp