When I was in my early thirties and had been an out gay man for more than ten years I had an affair with a woman. She knew I was gay and was totally cool with that. It lasted for about nine or ten months and was always an open relationship, though we were regarded as a couple in our circle of friends. I never stopped thinking of myself as a gay man while it was in progress. As I was fond of saying at the time and ever since, she's fucking other men and so am I.