Wife Is Showing Off For Neighbor

My neighbor called me over today to have a conversation and informed me that when he went through his son’s phone, that he found pictures of my wife. I didn’t believe him until he showed me the pictures… Apparently she’s been going over and dressing up and being his little model while he takes pics and videos of her. He’s only home for college during the summers so he won’t be here much longer but I’m not sure how to address it. It’s making me wonder how far it went and if she’s done this for other guys.