How can most men's worst nightmare turn me on so much???

For example my wife was seeing this guy in a band. She would go to the studio where they recorded and have sex with him. Obviously the band new her and was aware of the situation.

One night they were all at a bar (her lover hung out in our group of friends) and when we walked in he was there with the rest of his band. I felt ashamed but had a boner the entire time. Why would I like and want to be in that situation?

Simple.
You love your wife and you love sex and porn.
So what's better than watching someone you love in the throws of hot juicy sex.
You just wish you were there to smell the air in the room and hear her violent panting as he was stuffing his fat cock in her wet little cunt.
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