A Secret Session in the Garage

I've been married for twenty years now and we still have a solid relationship. Recently though, I started going to this private sex club once a month on my lunch break. It's been a way for me to explore desires that we don't typically indulge in at home, things like role-play and dominance dynamics. Last week, I met this guy there who was into handcuffs and blindfolds. We spent about three hours together, with him tying me up, spanking me gently, and fucking me hard while I was blindfolded. The physical sensations were intense and overwhelming; the sharp sting of his hand contrasted beautifully with how rough he was in bed. Afterwards, we didn't talk much, just exchanged a few words and that was it. My spouse knows nothing about any of this. Is what I'm doing okay? Are my fantasies normal?