Probably plenty of you do this already, but when I'm saying goodbye to girls, whether it be at their door or when they're about to leave my apartment, I've found that grabbing them close and drawing them in for a passionate kiss... Then gently but firmly shoving them away from you as you put on a shit eating grin and walk away works wonders.

I've had girls tell me that they love when I do this. Just another push pull technique for you guys to try out.