"#DDFFCasual isn't for discussing sexual experience."
Garuga pretty much sums it up here.
On most forums, chat rooms (unless it's 18+ chat room of course, then go nuts) and pretty much real life, it's frowned upon (if it's in a vulgar way, I mean)
I really don't understand the whole "There isn't a rule for it, so we can do it"
Think for yourself for once.
We have minds, etiquette and morals for a reason.
I'm not going to comment on the actual issue at hand because I wasn't there.
On an internet chatroom, using rules can result in... subjective situations. Which is why there aren't rules - more 'guidelines' to follow. In the end, it's up to the mods present at the time to decide how to best deal with a situation. The guidelines are just there to assist the mods in deciding whether what the person in question is doing is wrong or not, and whether it should be punished.