I,m a girl so i know how great this feels. okay so, guys, if you are with your girlfriend and you want to flirt a little bit then walk up to her from behind, kiss her cheek softly and whisper to her, make sure she still has her back to you. put your fingers under her shirt not in a sexually way but in a gentle tickling way and gentily run your fingertips up and down her stomach or sides. with you whispering and kissing her and your finger tips tickling her stomach gentily she,ll be in heaven.