I suppose if you're worried that a potential female partner will think you're lying, you could invite her to get coffee with you and your wife sometime. Sorry, I know I'm not the audience this question was targeted to.
Me, 30ish bi female, been doing solo poly for roughly 5 years. Gia, Clay, and Pike, my partners. Davis, ex/friend/"it's complicated." Eric, Gia's husband. Bee, Gia and Eric's toddler.