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There are traits, which are unfavorable to the individual in terms of spreading his genes, however, benefitting the population. Homosexuality can only be assumed to be unfavorable in terms of spreading one's own genes and also only if it is exclusive (cf. Ancient Greece).
It may be quite favorable if the population is growing too large and homosexual coupling results in fewer offspring
Since homosexuality is not proven to be solely based on genetics, it is not entirely true to call it a trait. A biological trait is purely genetic and/or epigenetic. Thus the premise is not worded correctly.
Sexuality usually is defined as a spectrum, which makes homosexuality being defined as a trait problematic.
Being homosexual doesn't necessarily cause someone to have less kids. We can observe that in our current cultures and in older cultures. The same applies to other animals
There was a study recently which connected a man's likelihood of being gay with his maternal family's fertility rate.
"Advantageous traits (that help certain individuals survive and reproduce) are said to be 'selected'"(Assuming selected=favourable)
Homosexuality has long been punished by environmental factors and thus not been favourable to survival.So at least one condition to call homosexuality favourable fails
The process of evolution does not require that enjoying sexual pleasure results in offspring. It only requires that individuals must pass on genetic material through sexual acts.
From a historical societal standpoint, it is also undesirable. Which begs the question: From what group standpoint is homosexuality desirable? I request a group standpoint because from individual standpoints, any number of arguments can be made regarding any topic.
maybe we should ask how strong we understand homosexuality:
- only preference for mens (include sex for children with women)
- only have sex with men (exclude sex for children with woman)
...however this is only relevant for the non-humans and non-aliens. Today we can adopt easily...