Ladies...Can you read a man's body language?

If you can...tell me this...What are the body language signs that he's attracted to you and wants to have with you and you just met him. (You both are walking down the street and you're approaching one another) What are things he does that let's you know that he's wanting to get it on even though you never met him. Regardless of whether you want to or not isn't the answer I'm looking for....it's irrelevant. I'm speaking about his signs of body language propositioning to you that he wants you and he wants you now. What would be some signs you would see in him?