DNA hell. I have ran across plenty of lesbians that were married for years and had a household full of kids. With absolutely nothing wrong with her sex life. All the sudden she turns 50 and starts going to the bars with her girlfriends, gets drunk one night and ends up in the sack with another gal. Comes out a couple of months later and tells her husband of 30 years she’s really a lesbian and wants a divorce, but it really had nothing do with him, blah, blah, blah.
Homosexuality a chosen lifestyle. When this gal I just mentioned gets tired of her “girlfriend” and a few more flings with other dykes, she goes back to her husband, if he will let her in the door. It’s all about sex, sex, sex.
Love has nothing to do with it. Many lesbians are in threesome relationships, or foursomes, or as damn many as they can get in the bed without it breaking down.
Every study I've seen on the subject has a reference to environment which is a very key factor.
Besides the example you provided, there are:
I don’t believe at the age of 50 it’s about sex at all. Your scenario sounds made up. I would bet if you really asked woman that age ‘why’ they switched teams, sex would not be the #1 reason.
Many, if not most, women have gone through menopause by the age of 50. Sex drive is diminished.