Is that not obvious? If a girl looks good, it is natural to ask yourself what this particular girl might be like on the inside. That's enough for being interested and wanting to talk to her. Only very seldom can there be other situations, where the looks don't play the initiative role. However, they always play the decisive role, and that, too, for a good reason.
I know the why but not the how.
I can be attracted to someone but to be "interested" is whole other thing in question. Yes, a good-looking man is kind on the eyes. Well, good for him and the on-lookers.
Now, I'm getting off topic here.
That depends a lot on the person they 'just met'.
I wouldn't say
a lot, but it certainly plays a particular role. As the setting does.
I'm just suggesting that a girl is probably not going to feel very comfortable if you approach her and say... after a brief conversation, ask her for her means of contact. Out of a club or bar, that's just ridiculous, isn't it? The guy might only have the sincerest intentions in mind, for he may never see her again without a number to fall back on. But the girl is left to wonder. That system does not work well within any other setting than a club or bar. Girls are very much aware or perhaps even expecting of it in such a place. But any other grounds and you might... 'startle' her.
While out with my friends, on a completely innocent endeavour, a man who I had never met before approached me and tried to 'pick up.' I was so taken-aback and put-off, regardless of how attractive he was. He wasn't coming on to me like a slobbering drunk and he wasn't even pushing it. He was relatively normal. By my rejection of him I might've hurt him, but that was purely out of concern for my own safety. So were a number of my (girl)friends who were also approached. We avoided him and his friends thereafter, because we did not feel safe.
I very much admire the ladies, but I never know what to say to them. I get so nervous and I wouldn't know the first thing to say to them.
If you know how to talk to people then you know how to girls/women/ladies, whatever have you. Of course... seeing as we are on a SA forum, you might already have difficulty in that general area.
I find a lot of the problems with 'not being able to talk to women' is the thinking that women need to be talked to differently. Sure, avoid
certain topics you might discuss with male friends, but in theory your end of the coversation stays very much the same. "Hello" is a nice place to start.