As I said before, we know that the FO did not follow proper procedures with respect to smoking and access to the cockpit so there is no reason to suppose that his RT procedures were any more correct.
I'm still trying to figure out why the FO is getting the blame for this? Isn't the Captain in charge of the airplane? Given what I've learned about Asian culture on Pprune, I can't imagine that the FO just decided on his own to allow the girls into the cockpit. I really don't even see him questioning a decision made by the Captain.
Now, maybe he should have questioned it - or at least reported it - but recently three "junior" pilots allowed a plane to be flown into the ground without saying a word, so....