Homosexuality is not uncommon in nature. Though there are cases of asexual reproduction, HETERO-sexual behavior is simply nature's tool for species re-population. Regardless, there is nothing more natural than the tactile exchange of affection between any two people regardless of what kind of parts they're equipped with.

https://en.wikipedia.org/wiki/Homosexual_behavior_in_animals
"Geir Soeli, the project leader of an OSLO museum exhibit entitled "Against Nature," told Reuters: "Homosexuality has been observed for more than 1,500 animal species"..."The sexual urge is strong in all animals. ... It's a part of life, it's fun to have sex," Soeli said of the reasons for homosexuality or bisexuality among animals."..."Greek philosopher Aristotle noted apparent homosexual behavior among hyenas 2,300 years ago"