I just want to second Anne's point that deeper feelings can sometimes strike when you least expect them. It doesn't mean it would have to diminish your love for your husband or hurt your relationship any more than sex did. But if that happened, despite your best intentions, if you realized you loved someone else and wanted to develop more of a relationship with them, would it be a disaster or something you two could accommodate?
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.