The Spartans were said to be homosexuals. They were likely raised from birth to be cognitively abnormal and mentally ill. Having no family/children of their own, they would fight without regard for their own survival.
Perhaps we should consider an additional branch...
The Spartans were iindoctrinated as bisexuals. At the age of 12 a boy started a sexual relationship with an older man, who acted as a mentor.
Most Spartan men married sometime after the age of 20, though they could not live with their families until they were 30. On her wedding night, the bride's head was shaved and she was dressed as a young man, to help introduce the groom to heterosex.
The "300" that marched out with Leonidas were chosen specifically because they all had living sons that could carry on their line, as it was assumed the 300 would all die in battle.
The history of Sparta and the rest of Greece at the time actually puts a real good dent in the notion of "sexual orientation" in the modern sense. Most upper-class Greek men played a "passive" homosexual role as adolescents, an "active" homosexual role as adults with the next generation of boys, and also married and raised families. IOW, they were perfectly functional bisexuals. This was the norm and ideal of the time, and was not considered an aberration or disgrace.
The Greek notion of beauty and sexual attractiveness was so tangled up with the adolescent male that roughly 20x as many images of such have been found from the period as young women intended to portray the same ideal. It is as if we were to walk down the magazine rack today and almost every cover had a 14 year old boy on the cover to help sell the mag. The sex that sold in ancient Greece was that of pubescent boys.
the people who said that were themselves homosexuals or homoenablers.
They conveniently (intentionally) mistranslated the ters Mentor/ Mentee into sexual lovers.
It would be like mistranslating the words student and teacher to homosexuals.