Personally, I'd agree that the idea or interest in it is more common or more openly discussed today. I'm just really curious how some of the trends compare thro

Personally, I'd agree that the idea or interest in it is more common or more openly discussed today. I'm just really curious how some of the trends compare through different parts of history (free love, less puritanical countries, or bigomy, etc). I would guess prior data would be even more biased by cultural stigma.