Making Love is completely different and you'll know the difference. If kissing is goin on, especially deep passionate kissing, it is probably "making love". If eye contact is made, if the person talks to you to ask you if you are ok...What about afterwards, any cuddling, kisses, intimate conversations? Do you stay all night then? These are things you have to look at. Is this person a part of your everyday life, does he or she call/txt just to see how your day is goin. If no to all of these n the calls are in the middle of the night, then it is most likely just some casual sex. I've had both and can def. tell the difference.
some years of personal experience :(