The 88/11 Rule
When you walk up to a girl and start a conversation (while hopefully touching her early in the process), you'll find that some of chicks immediately are super receptive and talk and touch you back. These girls are obviously interested in you and sexually available if they let you touch them. This seems to happen more at night because physical dialogue is more common and alcohol is in the mix. The obvious "strategy" is get them to a private place ASAP.
More often, however, you'll run into chicks that don't seem to give you a whole lot- at least not much verbal talky talky in the first 2 or 3 minutes. Unless they are actively resisting your physical advances, you can't really draw any conclusions about their interest level or sexual availability. There's a number of reasons for this that I'll explain in a minute.
The most obvious is- in general, people just don't talk to strangers. Guys don't talk to girls they want to fuck. Girls don't talk to guys they want to fuck. It's just a social norm.
The next time you run into a girl that isn't talking too much in the few minutes I want you to remember "The 88/11 Rule," the rule is-