What does a kiss on the forehead mean when it's just a sexual relationship?

kissy1
I met this guy a little while ago, we both agreed on a just sexual relationship nothing serious. We talk or text everyday, we hang out quite often even though we don't end up having sex. We have an awesome time together in and out of be. Here recently when he leaves he gives me a kiss on the forehead after he kisses me on lips during the hug good-bye. I am confused on how I should react or take that in general. What does it mean? I have asked to friends but they tell me it is endearment that he loves me but I know it is too soon for that, and some tell me to get out now cause he sees me like a sister. Not sure what to base it on. He is a great guy, I wouldn't mind if he is wanting more. I like him. Just wanted a mans perspective on the whole thing. So what is it meaning?
What does a kiss on the forehead mean when it's just a sexual relationship?
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