Editing Biology and sexual orientation (section)

===Pheromone studies===
Research conducted in Sweden<ref name="Savic_2005">{{cite journal | vauthors = Savic I, Berglund H, Lindström P | title = Brain response to putative pheromones in homosexual men | journal = Proceedings of the National Academy of Sciences of the United States of America | volume = 102 | issue = 20 | pages = 7356–61 | date = May 2005 | pmid = 15883379 | pmc = 1129091 | doi = 10.1073/pnas.0407998102 | bibcode = 2005PNAS..102.7356S | doi-access = free }}</ref> has suggested that gay and straight men respond differently to two odors that are believed to be involved in [[sexual arousal]]. The research showed that when both heterosexual women and gay men are exposed to a testosterone derivative found in men's sweat, a region in the hypothalamus is activated. Heterosexual men, on the other hand, have a similar response to an estrogen-like compound found in women's urine.<ref>{{cite web | vauthors = Wade N | date = 9 May 2005 | url = https://www.nytimes.com/2005/05/09/science/09cnd-smell.html | title = Gay Men Are Found to Have Different Scent of Attraction | work = [[The New York Times]] }}</ref> The conclusion is that sexual attraction, whether same-sex or opposite-sex oriented, operates similarly on a biological level. Researchers have suggested that this possibility could be further explored by studying young subjects to see if similar responses in the hypothalamus are found and then correlating these data with adult sexual orientation.{{Citation needed|date=March 2007}}