What does it mean when a guy jokes about having sex with you?

He's my guy friend, I liked him for a few months and he knows how I feeel about him. He's never pressured me into having sex but he always jokes about it. He recently got a girl friend but he still makes dirty jokes with me and he asks to see me a lot even though he has a girlfriend :S
What does it mean when a guy jokes about having sex with you?
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