In a moment of truth (and with a couple of martini's under his belt) my DF'd father told me the break up of his marriage to my mother was directly related to her refusal to do anything but "missionary." My mother would apparently try anything and then it dried up....literally!
He told me my mother, a staunch JW, would gladly "swing" before she became a JW. Then she got baptised and it was over. He was forced to seek release with other woman. They were divorced in 1975. He told me about 3 months ago.
I am debating whether or not to confront my mother and ask her for her side.
To anyone needing a class on 69, the latest Cosmopolitan magazine has a complete, fully detailed "how-to." Very informative and educational.