tricky one.
if you tell the police or woman, he may be genuinely innocent and it just hadn't occurred to him.
if you mention it to him to warn him how it could look, if he is up to anything he will just be more careful to hide it in future - however if he was up to something, if he was a calculating paedo i think he'd would know enough to have been keeping it hidden already, not be open and public about it.
lets face it, if you are up to no good you are not going to broadcast it are you?