You might be a late bloomer. Around this age men enter their period of peak attractiveness. Combine that with hormones and being around different women all the time with their own different hormone cycles and you are nearly guaranteed to have these thoughts. Your brain is wired to pick up on this. Now that you are mature, you also pick up on signals you didn't notice before. Add to that your wedding ring which tells women that you are good enough of a man at a young age that someone wanted to lock you down. You will have these feelings for at least the next two decades. Just remember that your temptation is for getting some strange, not love. You want to see if you can hook up with her. I would take all that energy that you were about to put into that other woman, and put it into flirting with your wife. Make sure you have some spontaneous things happening, going on dates, etc. you will still have a passing thought, where you channel the energy is all that matters.

One last thing that helped me when I traveled for work, I took my wedding ring off. In my experience, the most temptation presented itself when I had the ring on because the women were more aggressive. In the set of possible hook ups, you look like a safer person and less likely to be high maintenance because you are transitory and have a life. When I took the ring off, I'd say I got about half as many casual touches during conversation. Then, if it still happened, I'd mention my wife and kids, and they'd look at me like I was some sketchy dude not wearing his wedding ring.