I have mentioned how I found myself in a poly situation in other threads.
The short version is before I met Butch. I would flit from monogamous relationship to monogamous relationship like a butterfly going flower to flower. I found my eye wandering about 9 years into my marriage. I was honest with Butch and he brought up polyamory as an alternative to divorce.
40 yo straight female
Married in the eyes of the government to Butch since 2001...
Murf my monogamous second husband has been with me since May of 2012.
In a V relationship with an average 60/40 split of time. Only due to Murf's and Butch's crappy work schedules.