All of what you say here is quite right.
From personal observation, I note that among male homosexuals any kind of a long lasting pairing is nearly impossible. The reason is promiscuity of one or both. Eventually the promiscuity demon breaks apart these pairings. Female homosexuals do not appear to suffer from promiscuity to the great degree males do. Female pairings can last for years; sometimes for a lifetime. However, it is the male relationships that are very, very unstable and of finite duration.
However long these “relationships” last, they are sick.
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Lesbians may stay together for longer periods of time, but they are promiscuous. Whether they are as promiscuous as male homosexuals, I couldn't say.