Is it normal that i like cleaning up my wife's pussy when she has sex?

My wife and I are pretty open in our marriage. We both flirt outrageously, but always go home together. Sometimes my wife has taken the flirting to the heavy duty level, and has come home a bit late, with a pussy full of semen. I look forward to this happening. She had an affair with a pilot, so she got together with him whenever he flew into town. I had no idea that this was happening, and I have since found out that every time she screwed him, she made sure that I ate her out that night. We have always really enjoyed oral sex, so this wasn't anything out of the ordinary for me to go down on her every night, and as a consequence I think that I became used to the taste of another man's cum in my wife's pussy without realising it. I never really had a problem with my wife's screwing around, because whenever she got some, I got her afterwards, so we both won. So my question is, is it normal for me to enjoy keeping my wife's pussy clean when she has been out and about?