Originally Posted by
ruinedmirage
Two reasons:
First, you can't guarantee the age of the person you're ERPing with (to SE's satisfaction, how do they know you two know each other, etc.)
Second, if ERP was condonable or encouraged by SE, the ESRB might need to change the rating on it.
Of course, play experiences may vary and stuff like that. Everyone has their own opinion, and publicly displaying ERP in-game (which I should've stated earlier, my bad) is just bad form in my opinion.
In private is fine, if you're wondering about my stance on it.