Do guys let just any girl sit on their lap?

Or does a guy only let girls he likes sit on their lap? Also I was sitting on this guys lap and I was really just on his thighs and he told me to scoot back pretty much on him. Did he do it to be comfortable or because he likes me and just wanted me closer to his...? I figure if he didn't like me he wouldn't have let me sit on his lap, so does he like me because of it? I like him, I'm 99% sure he likes me too but just can't admit it urgh.
Do guys let just any girl sit on their lap?
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