Keep the ball rolling; please understand that the words I have listed here are mere suggestions.
Another thing that you could do is that from the moment you first make contact, jot down whatever details the person chooses to reveal to you and in subsequent encounters nonchalantly question the person about the details, if there is a contradiction in the two details then you can be as sure as pat that the person is lying.
The best thing that you could do is avoid instant intimacy altogether.
Once you find the character of the person agreeable you will start liking the person as a whole.
You keep your eyes open but you are very dependable though sometimes you might end up poking your nose into things that do not concern you.
Sex is a fundamental need of every human being.
You might meet a lot of people over the net and you might chat with a couple of them.
You had better choose a public place preferably somewhere where there are plenty of people around, just in case, you know.