and... if you have roommates, you need to understand that they may or may not share your love of guns. Roommates may get drunk and come home at 4am, that's one reason why I lock all my guns up. GF needs to needs to figure out the difference between a possible home invasion and roomie comming home drunk.
Just remember, when you pull the trigger, the bullets come out going very, very fast. So make sure to keep the weapon pointing away from you.