Some feel genuine, maddening, stinging jealousy when their lovers are with other partners. One woman says she feels physically sick, another sees tunnel vision, and a third loses control so much she feels like “other people are driving the bus and I’m not even close to the wheel.” They flinch when their lovers have sex with someone too similar to themselves, or writhe with discomfort when they feel their power in a relationship threatened. And yet, these women stand by their non-monogamous lives.