I THINK YOU'RE ALL MISSING THE POINT...
Yeah on these boards some of those lines are funny, but IRL that sh1t DOESN'T WORK. She's not looking for some lame-ass joke that will convince her "what a great guy you are"; instead, she's IMPLYING 1 of 2 things.
1) "FVCK OFF. For some reason, you bore me, aren't good-looking enough, and/or haven't proven your worth. I don't want to have anything to do with you, so please, leave me alone. I don't want to reject you directly so I'll tell you I have a bf and hope you catch on."
-in this case, your "C+F responses" will do absolutely jack-sh1t. It'll only piss her off more. It doesn't matter if she has a BF or not; she wants you out of her face. Don't take this one personally: just realize that this is the time to eject.
2) "You're cute/charming/funny/interesting, but you haven't given me ENOUGH reason to sleep with you yet. If you adjust your game a little and persist, you might just make me wet enough to get me. I'm challenging you to seperate yourself from the other men and STEP UP to the plate... how bad do you want it? Show me you're willing to work for me."
-here, she's hooked but she still needs more reasons to JUSTIFY anything she gives you (number, date, lay). She's offering a challenge that 90% of (AFC) men will fail. This is where you shine. Now, most of those lines will come off as try-hard, desperate, and make you look like you're pretending to shake off a REJECTION. Instead of a C+F line, come back into this game with an ATTITUDE that will sweep her off her feet.
BOTTOM LINE: With field experience (read: getting out there and getting shot down hundreds of times), you'll start to be able to recognize which one she's implying. Women HATE stating things directly; they much rather HINT stuff and hope we get the drift. Read body language (tonality, body/body part position, lean into you, head, eyes etc etc) to get the vibe. When you can tell these two apart, you've mastered half the game. I will tell you, though, that if it's case one, NONE of these lines will work. SHe's just simply not interested in playing your game. Don't make a fool out of yourself... there are SO many other chicks out there who want you (right?)
Also, I need to stress that if it's case two (ie. she wants more to justify her actions), don't look for a line to use... look for an ATTITUDE. Be the man that she *might* be able to get *IF* she's a good girl. CALL HER ON HER BULLSH1T!! "I have a boyfriend" HA! Little does she know what you have up your sleeves. You don't need her... lol.
Plus, if you play it right and she chases you, call her on her own sh1t later: Let's say she touches you or moves to kiss you: "Woah, slow down there. I thought you said you had a boyfriend?" *grin*. Make her WORK for it. Turn that sh1t on her.
Yeah. But whatever you do, don't take "i have a bf" (let's start the acronym IHAB-- coined right now) TOO personally, guys. Maybe she's having a bad day and doesn't want to be PU'ed. next. If your game is tight this stuff will come naturally. Figure out what her body is saying and not her mouth.
PS. If you ARE going to use a canned response, don't ever EVER EVER diss her bf. bad idea.