so you manually blocked www.playboy.com
and yet you can still see it?
Is the client actually going through the WWW proxy? E.g. if the client is using NAT (set default gateway) and you don't have the WWW proxy intercepting connections, then the client may be bypassing the proxy.
It's also possible the manual block rule is not set properly
It's also possible that PureSight is not enabled on the WWW proxy.