Chances are, if they're being extra touchy feely with you and making constant body contact, then they want to kiss you.
The biggest sign is when you're saying goodbye at the end of a date or meet-up.
Make sure you take it at your own pace because they're in absolutely no rush to get it done and over with. The best tricks you will learn, however, will come from experiencing the act of your first kiss and then practicing a second, a third, and so on.
The first teenager kiss is a rite of passage that millions of people experience sooner or later.
The act of locking lips is more about showing someone how you feel, and the first kiss is almost always the best.
If they're looking back at you and making eye contact, the kiss will happen naturally as you automatically both lean forward.
You can often just feel the chemistry when you're about to kiss - it's the nervous anticipation on both sides - and you won't be able to miss it!
Your first kiss can last as long as you want it to last.