The single most obvious way to tell if a girl is ready to get physical with you is "Do a Proximity Check". How comfortable is she when you're close to her? Does she always try to draw a distance between you and her, even when you're walking beside her? Or she doesn't mind even to accidentally rub her breasts on you. Some of the things you could try are,
- When you're having dessert say ice-cream, offer one spoon to feed her. Does she accept your feeding?
- When you're in the cinema, does her shoulder rub against yours? If yes, ask her if she's feeling ok, by gently touching her hand. Observe her reaction
- When you're alone with her, try caressing her hair near her ear.
- When you guys are having fun and talking about jokes, try pitching her nose. How did she react? Did she back-off, or she, in fact, moved forward to let you pitch her.
I once was at a pub drinking with some friends and there was this girl whom is a friend of a friend. We hardly talked when we were at the first pub, since there was a friend sitting between us. But at the 2nd pub, there was a moment that she was kinda standing close to me. So, we began talking....and drinking...and next thing I noticed was she was very close to me. In fact, her face was very near to mine (there was no music at the back since it's almost closing time). The first thought that came to my mind was, "Hey, this girl is ready to get physical". And baaaammm, I went for the kiss and it worked!
From kissing we ended up making out in her car. The car was too small for us to go beyond kissing and petting. She was still pretty much sober, while I was pretty drunk. Anyway, we ended up in bed on the next day, after a romantic dinner over wine.