guittarjedi,
This is an intriguing question that you've posed to the forum.
I don't think the link in squirrels' reply, for the article on Casual Sex addresses the matter entirely because where do those women who are f#ck buddies fall into the spectrum? Other posts talk about FB's so I won't do that here.
In my opinion, a man's entire demeanour (his attitude and how he conducts himself) communicates and projects sexual intent.
If you're comfortable with being a sexual being and you're masculinity inside and outside are inline (meaning synchronous or congruent) then the rest of the world will see that comfort and accept it too.
No woman who's interested in you will reject your sexual advances. I totally agree with what the other DJ's have said about this in responding to your question.
As far as how far and how fast you should take it is entirely up to you. Follow your instinct and don't care about making mistakes. It's better to be chastised for being bold and courageous (i.e. a man) than it is to be thought of as being less of a man for not taking a chance.
Cheers,
Mav