Yes, it's called being polyamorous. Many newbies think being poly means a couple sharing one lover, or constant group sex of some kind, but actually the way you and your husband and lovers are doing it is much more common, and successful, and less complicated, and less stressful, and less prone to triggering jealous feelings, than triads, or quads, or several lovers each.
Glad it's working out so well for both of you! How nice that you trust each other, and found this way for more sexual and love experiences, despite being virgins when you committed to each other.
Love withers under constraint; its very essence is liberty. It is compatible neither with envy, jealousy or fear. It is there most pure, perfect and unlimited when its votaries live in confidence, equality and unreserve. -- Shelley
me: Mags, 59, living with:
miss pixi, 37