It was at first a playful fancy of the ruling classes but then grew into a cold yet efficiently run military system of battlefield man-pleasuring. It’s a statistic that shocked many viewers in modern Japan, but there is ample evidence to support that a whole lot of gay sex was going on in the country from between 14.
Recently a Japanese TV program highlighted an interesting bit of historical trivia: The most common type of revenge killing in the Edo period was between gay lovers.