Videotaping people's asses when they walk-- and taking photos of your daughter!!!-- is a violation of their rights and privacy. If he is doing this, that means he has problems with impulse control and is putting his desire for sexual gratification before the rights of others He's also attracted to your daughter, which seems very problematic. I'm sure she would feel violated and repulsed if she knew. As her mom, this can't be okay with you. It sounds like this guy has some very serious problems. Do you really want to be with someone who is looking at all of your friends and family members to fulfill his sexual needs?