ONETRACK, I think you are mistaken.
regarding FO's casual attitude about cockpit security. are you aware the captain would have to "OK" visitors in the cockpit and not the first officer?
are you aware that some countries allow for cockpit visits, the USA doesn't, but it did 50 years ago, so it is not unheard of (thanks to United Convair 240 crew that let this former 8 year old boy stand in the cockpit, looking at an orange radar screen with hood)
IT IS QUITE HEALTHY in my view for a pilot, age 27, to want to have cute girls in the cockpit. FOR THE RECORD malaysian airlines didn't punish him 3 years ago and only expressed some outrage recently (a
PR ploy if you ask me).
IF you want to have cute girls in the cockpit, you probably don't want to hijack your own plane.