My girlfriend has some social boundaries that I need to set for her. She is sometimes so naive as far as social situations with guys are concerned. She doesn't realize that by talking to guys in certain ways she is giving them signals that could be misconstrued as her showing interest in them.

People say don't mate guard but this isn't behaviour that is compatible for me in an LTR. I don't want to just next her because besides her social naivety she is a great partner. Submissive, attentive, great sex, we very rarely fight and when we do it is in an adult way and not a scream fest.

How do I go about setting these boundaries? Is it best to confront her about them at the moment that they are happening? Should I just bring it up at some random time? How should I word it?