I was 22 when I got married and my husband and I introduced each other to heterosexuality, to use your turn of phrase. We've been married 5 years and I've not once experimented or had relationships with others. I find it rather shocking that you consider such fidelity abnormal.
I will say it again, because it is based on my observation during my long life.
Fidelity between homosexuals is very rare. They are a promiscuous group. In fact, they are somewhat obsessed with sex. With the stories, and the jokes, and the parties, and the costumes — all with a sexual twist.
That’s my opinion, and I’m sticking to it.
You are comparing a natural relationship to a homosexual one. Not the same thing.