Editing Biology and sexual orientation (section)

===General===
{{See also|Gene-centered view of evolution|Evolutionary psychology|Homosexual behavior in animals}}

Sexual practices that significantly reduce the frequency of heterosexual intercourse also significantly decrease the chances of [[Reproductive success|successful reproduction]], and for this reason, they would appear to be [[adaptation|maladaptive]] in an [[evolution]]ary context following a simple Darwinian model (competition amongst individuals) of natural selection—on the assumption that homosexuality would reduce this frequency. Several theories have been advanced to explain this contradiction, and new experimental evidence has demonstrated their feasibility.<ref name="MacIntyre_1993">{{cite journal | vauthors = MacIntyre F, Estep KW | title = Sperm competition and the persistence of genes for male homosexuality | journal = Bio Systems | volume = 31 | issue = 2–3 | pages = 223–33 | year = 1993 | pmid = 8155854 | doi = 10.1016/0303-2647(93)90051-D | bibcode = 1993BiSys..31..223M }}</ref><ref name="Buss 2016 pp. 20–22" />