I am vaguely aware of the societal structure the Spartans lived under and to the extent they practiced homosexuality seems to come from retrospective views imply such behavior was dominant due to the companionship of males. Nevertheless, as the above commentary has shown, it is anathema to the American experience.
The organisation of Spartan society was certainly rather unusual. Boys and girls were separated at the age of seven. Boys were put into compulsory training that led directly to the military, from which they emerged in their late 20s. Lovers were encouraged to go into battle side by side. The theory was that soldiers would fight especially hard to protect their lovers. It seemed to work: the Spartan army was extremely successful. Three hundred of their elite troops held a pass against 30,000 Persians, until they were betrayed.
The state made marriage and children compulsory. The standard organization of a Spartan home became two male lovers at the centre, both married with children, and often owning slaves.
The Spartan experience suggests there is nothing inherently incompatible between homosexuality and military service, though it is worth questioning how much can be learned from the experience of a society so very different from any modern one. It also suggests that the claim that homosexuality is always or usually genetic in origin is open to considerable question.
Those societies always included pederasty. The complaint among old men was concerning their young boys who would become young men and dump them for a younger more beautiful man or boy.
Spartans killed babies who were considered imperfect. When boys became ready to leave their mothers they were mentored by older men..introduced to the "joys" of homosexual sex. The boys became conditioned to be homosexual.
Women were only used as breeders. The men used each other for entertainment and discussions and soulmates...women were always second class citizens in homosexual societies...like in ancient and preWWII Japan and many other cultures.
You have no equality between the sexes in homosexual societies and slavery always existed. Lust is the No. l virtue along with pleasure (which never included women).
Homosexual cultures are extremely ugly for children and women. Christianity is what elevated the status of women and built upon the Jewish concept of marriage and the importance of sexual fidelity to strengthen the survival of women and children by having a protective male in their lives. It is a superior model to all other models that gave status and equality to women and gave protection to boys particularly.