Sometimes I just have to wonder why bother? Another one come and gone.
Sometimes I wonder if the ones that leave that fast get fucked up messages or something.
Perhaps an experiment is in order.
Someone might consider setting up a (female) test profile and creating an introduction, and seeing what kinds of PMs newbies receive when they arrive.
Most sites frown on multiple accounts, and I doubt RU is any different, so the test profile would likely need to be created by an administrator/moderator.
That's about the only way to test the 'fucked up messages' theory. It's not like the newbies who came and went are still around to ask!