It depends on your users. If you keep an eye on the logs, and start redirecting the sites to a suitably worded page of your own then they may start to get the idea.
You can also start banning sites with particular words in the domain. eg, xxx, teen, etc. - again depending upon regular use.
Failing that you're going to have to buy some additional software. But I can't help you on that because I've never had to do it.
We use SurfControl's WebFilter which 'plugs' into the Web Filter section in ISA. Not the cheapest, but very good. They maintain categorised lists of sites that are automatically updated to the ISA Server. You can grant different users different rights (we use AD groups to do this), and you can even set allowed time periods, e.g. only allow Sports sites outside of working hours.
NetIQ has a pretty reasonably priced keyword filter product that doesn't require a subscription to a blocked site list. I've used it with great success.
It's called WebMarshal, and this new version works as a plugin for ISA as well.
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