I just answered with my own knowledge. But, some non-english speakers they don't want to hear. For that reason, my asnwer has been deleted. It is too danger that the non-english speaker who are misleading by someone who don't know the culture.
Ask out for a drink, it is the culture that the man is asking for a date. I hope there must be some other American readers here, please tell them what does it mean. It is very danger, if she accept of going for a drink. Here, the asker may think differently, it is their culture.