"My fraternal twin and I (both men) are in our late 30s. We were always extremely close and shared a bedroom growing up. When we were 12 we gradually started experimenting sexually with each other. After a couple of years, we realized we had fallen in love. Of course we felt guilty and ashamed, and we didn't dare tell anyone what we were doing. We hoped it was "just a phase" that we'd grow out of, but we wound up sleeping together until we left for college. We knew this could ruin our lives, so we made a pact to end it. We attended schools far apart and limited our contact to family holidays. But we never fell out of love with each other, so after graduation we moved in together and have been living very discreetly as a monogamous couple ever since."
-- From a letter to Dear Prudence asking for advice on whether or not the gay twins should tell their family about their relationship. Prudence gives some thoughtful (and maybe shocking) advice.