A cocktease is a girl that makes a guy horny, but never goes further than that becuase she is:
A) A girl that knows that a good time does not have to end in your bed.
B) Somebody that is spontaneous and friendly to everybody causing weak guys to be under the false and desperate impression that she wants more than friendship.
Tom: wow this girl is so fucking HOT. She danced with me, kissed me on the cheek, shared a drink, even let me rub her back.
Mike: She totally wants you dude!
Tom: Hey baby want to go back to my place for coffee?