I am of the considered opinion that there is a bit too much childishness about.
Whats the point in posting a topic if it gets totally hijacked by lame jokes - silly pictures and obvious sexual innuendo ad infinitum.
Quite a lot of posts should be kept to PM's when they become a conversation between 2 posters and really of little or no interest to the rest of us. Should a thread develop into a different topic/ or become a series of humourous anecdotes etc. then maybe a new thread should be raised altogether.
I think a joke is OK here and there and de rigeur in the Soap Opera section but not at the total expense of making the initial topic irrelevant or forgotten.