For many of us the perfect kiss is a myth. Much like the Easter Bunny we wonder whether it truly exists, or if it's just another Disney-induced fairytale. However guys and girls, we'll let you into a little known fact: that special smooch does exist, but only if you are kissing the right person. So, if you want to know whether you should have sex with your date, pucker up. If a kiss with your date leaves you feeling weak-kneed then you know that they're a good match for you.