This question bothers every teenager, but not only teenagers are in the dark here.
The majority of men wonder about it when they are on the first date.
So how do you know when the time is right?
There are several symptoms are many, but I will write today about the most explicit one. When you're with a girl and at some point you see that her eyes begin to "jump" from one of your eye to the other at a fairly rapid pace this is the right moment. Kiss her then, a kiss will be 100% well received.
This is the fundamental reliable method. Soon you will be able to read here about other symptoms.