Imagine a situation when you are out with a girl on a date. It is 2 AM already. It is not the kind of dates which will end up in bed because nobody is hooking up. She has a friend with her ( a designated driver) who will drive her home safely and you decide that you have had enough this night - you have your life and huge responsibilities towards your clients next morning so even if there was a chance of hooking up you value your clients higher at the moment and you decide that it is too late and it is time to pack your bags.

How do you do it without looking like you have lost interest in the girl?