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She was terrifying. A tall, blonde, vegan who was seven years younger than me - and she never wore a bra. She was my husband's girlfriend.

My husband Per and I were exploring Consensual Non-Monogamy (CNM), which is an umbrella term for non-monogamy that includes open communication, mutual care, and consent. The learning process was uncomfortable. We had dabbled in friends-with-benefits relationships while Per and I were in a long-distance relationship. But neither of us had ever sought a relationship in the way Per was now dating his girlfriend.