Are some of us born gay? People have argued that sexuality is determined before birth, while others believe the environment has a role to play here. So, what does the science say? To find out Wendy Zukerman spoke to Prof. Jenny Graves, Prof. Jacques Balthazart, Prof. William Rice, Dr. Ilan Dar-Nimrod as well as comedians Tom Ballard, Rhys Nicholson and Kyran Wheatley. More Information Minireview: Hormones and Human Sexual Orientation by Jacques Balthazart http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3138231/ Genetic study into male homosexuality http://www.ncbi.nlm.nih.gov/pubmed/25399360 Sexual orientation in women with congenital adrenal hyperplasia http://www.ncbi.nlm.nih.gov/pubmed/18157628