No. Your friend has probably heard that from another friend. Do yourself a big favour and try one of them out, make your own opinion based on facts... not from something a “friend” said to you. Obviously there are going to be some strange folk on these types of sites, but on the paid adult sites, it’s seriously such a small percentage that it’s not even worth worrying about. Listen, if adult sites are good enough for MP's in Parliament then they are good enough for you!