Good points made indeed. However another thing to consider is we read the subject of topics before going into them. If someone sees a "Picture Thread (Boobs Welcome)" on it and don't want to see that type of thing on here then they are certainly under no obligation to click on that particular thread.
Is this an appropriate forum for such things?? That is an answer that each person must come up with for themselves. Personally while there is much good on this forum for answers and things like that, there is in my opinion nothing wrong with clowning around like that either.
Just my 2 cents
-Rick