So tonight my gf is on a night out with her sister and gay best friend.

I can't help but think her choice of clothes is a little out of order for somebody who isn't single.

Very short dress no bra boobs very visible etc.

I'm wondering how to respond to this. I feel her behaviour is impropriate for a LTR relationship. But at the same time how to approach the situation without coming across as insecure?

You might be reading this thinking that I am insecure and just need to get a grip, girls will be girls, they dress a bit slutty on nights out and that's just the way our over feminised culture has encouraged them. Which is fair enough.

It just puts me on edge. Maybe I just need to man up about it.

Our relationship is highly sexual, she's smitten with me and spoils me with her cooking and surprise dates regularly.

What do you guys think? Should I confront her about it and set some boundaries or just STFU?