Rule #1 of having a mistress: DON'T TAKE PICTURES.
If you keep them, your wife will find them. If she keeps them, they will turn up. Your ability to play "wasn't me" until the wife/press/team spokesman tires of it is shot to hell.
Even if it is a public event and can be brushed aside as an innocent photo-op, avoid it. Remember the video of Clinton shaking Lewinski's hand? How many times was that thing broadcast after the scandal broke?
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[The movie business] is a cruel and shallow money trench, a long plastic hallway where thieves and pimps run free, and good men die like dogs. There is also a negative side. - Hunter S. Thompson