Yes, "snooping" is not the healthiest, but when it results in finding things that should be known it becomes more "investigating". In all fairness, we all get a little weird on the internet every now and then and ONLY for that reason would I confront him for an explanation. Furthermore, we can all be a little twisted in our fantasies and not look to actually make them realities. Even still, I would not tolerate the callousness of engaging other women in flirting and what not and I definitely do not think that pedophile red flags should go ignored especially when these girls rely on you to protect them. I agree that a clear confrontation with hard boundaries is necessary. This is not something to ignore.