Google and inbound link rule

I wish Google would sort out some other kind of rules here ..

I run another website based for children with a forum and last night was utterly disgusted to find a link to an adult black porn site linked from it ..

I filtered through the 138 members who had signed up for the forum and after deleting all the members who were advertising dating agencies / medical sites / casinos / porn etc etc the forum is left with just 36 members ..

I have now made the forum so I have to approve new members and so far today have had 3 members try and join who basically are looking for inbound links ..

I created a new forum to explain how to sign up and had written that the website was for children and how I thought linking to adult content was sick .. I had forgot to make the forum for regsitered users only and could not belive some that tosser had the front to make a guest post in that topic linking to obscene content in less than 8 hours of posting it ..

Due to the fact that people uninvited use forums / comments on bloggs to link to thier often weak websites to get a higher page rank in google, I have had to turn off comments on all of the bloggs I run because it was getting too much of a task checking them for links each day ..

Which is such a shame because websites that are designed for discussion can no longer serve that purpose without getting abused .. I just don't have the time to check each site every few hours ..

Anyway I am extremly pissed off .. again thanks to all you retards !!