I had a recent night out at the bars with a group of four friends (plus myself). My friends are mostly taller and better looking. I didn't approach any, but there were many attractive girls. It seemed like more than I had seen in the past. So I'd like to mention three scenarios and get your reactions.

1. Two very attractive girls were sitting together for a while. A little later, a (not attractive) guy started talking to them and sat down there, and then a second guy did almost the same thing. It's hard to tell if that was a planned double date or a cold approach by those men. Tell me if this is a good line to have used: "Hey, are you waiting for anyone?" If they say yes, try to gain interest and go for the phone number. If no, sit down with them.

2. Many women are out with groups of male and female friends. It is hard to tell if they are couples or friends basically. There was one girl who was 100% my type, but she was literally surrounded by guys. I'm not joking when she sat down, there were three guys standing up to her side facing her and one guy hovering behind her! There were a bunch of other people sitting at the table as well. Besides talking to her by the bathrooms (she didn't leave to go), is there any way to approach a girl like this? Maybe I could talk to one of the guys first? Could I try joining their group?

3. I was sitting at a small bar talking to the bartender about the choice of drinks. My friends had been talking loud about how I needed to get laid tonight. This attractive Australian girl sits down next to me. They suddenly quieted down, probably looking at me and her. Almost right away, she put her arm around my upper back and had super open verbal and nonverbal cues. I didn't do anything to prompt this as far as I know. I could tell by her accent that she wasn't American, and she said she was from Australia. She was with two gay guys. I was stupid enough not to escalate. She said bye and left after 5 minutes. Thinking back, I would ask, "So where are you staying?" or ask for her phone number. Is this girl's chatting me up an example of social proof or a woman who simply had a few drinks?

Hopefully you'll find this interesting and I'd like to hear any advice on this. Thanks in advance.