No. When I'm having sex with my wife, my mind is completely on the glorious feelings I'm getting, the soft moans she releases, the way she strokes my back or spread her legs. I'm completely absorbed in the moments of fucking, the clenching of her pussy on my cock, the sliding in and out. When she sucks my cock, I've got nothing on my mind other than how good it feels to fill her mouth. I'm not focused on anyone but me and her. None of her friends, no slim athletic body young gal I might have seen in a store, etc. are on my mind.
On the other hand, she confessed to me on Sunday morning that she was thinking about her "list" of stuff she had to do in order to get ready for Christmas while we were having sex just 5 hours earlier. Geez, Louise. She did, however, had an orgasm so she must have at least momentarily NOT thought about anything else.