Ya, aggressive girls are great. The best advice I can give is to steadily ramp things up. Steady, not slowly. You can attempt to start making out right away. If that goes will, proceed to feeling up. Over the clothes, then go for under the clothes. If that's all good, go for the digital penetration (that's fingering, for you noobs). If that seems to be a hit with her, ask her if she wants to "find a spot to lay down?". Or whatever wording you need, depending on your current location. Basically, you will have to come right out and ask her if she want to have sex at that point. Enjoy it. Do not ask yourself why this girl is going so fast. Do not ask yourself if this is going to hurt a chance at a long-term relationship. This girl is not concerned with that. Do not ask her either. If she is concerned about it, she will ask you. If she doesn't ask, don't ruin the mood.
Ask after you're done getting as far as she'll let you.
The key thing to remember is, you back off as soon as she starts showing signs of being uncomfortable during any of those advances. If you are making out, and you start feeling her on top of the clothing, and she moves your hand away, leave your hands off her. Don't force it. Try again next time. Next time. Not five minutes later.
Either way, definitely attempt making out with her. If you're too much of A Nice Guy to make any further advances, you run the risk of her losing patience with you and finding some other guy to do whatever it is she intends to do with you.