right, the be all and end all of 'x' analysis:
x = The guy is just being polite
xx = Indecisive, probably has issues with commitment. However, they could be 'testing the water' to see how you respond. (He could have just pressed the x key twice accidentally)
xxx = He want's your babies, get in there!
xxxx = The guy's desperate, possibly with obsessive, stalking tendancies. Steer clear unless you enjoy the thrill of the restraining order
xxXXxx = He would like nothing more than to be tied up and gagged whilst you pour hot wax on to his nether regions.
XxXxXxXxXx = He's gay and in denial
So now you know