Caught unsuspected video wise, what would your reaction be?

If you found yourself in this situation, no it is not mine, how would you react to it? You vacationed in Europe 3–4 years ago. You ran into an old colleague/school mate, etc. They just lauded on this beach, but it was also a topless beach. The old acquaintance and his/her mate pestered you not to look like a foreigner, and that the females should sunbath topless like the locals. You relent; they swore up and down the beach was safe, and OK. Your SO (you if you are female), and your daughters, one a teen, the other a preteen sunned themselves topless. Now, four years later someone you know well enough to know they were not lying, says on their cousin’s computer they seen your girls, (you too if you are female) in a video on some Website geared to gonzo amateur sexual adult entertainment. How would you handle that?