Well it's not just for guys, it's for anyone who wants to improve their vagina pleasuring skills. Lick is an internet-based smartphone app that helps strengthen your tongue muscles for pleasuring a lady. Who knew? I always thought the best exercises were squishing Jello between my teeth and blowing bubbles in chocolate milk. You just wrap your phone's screen in plastic wrap (or not), and choose one of three exercises: flick the light switch on and off, turn the pencil sharper, or keep the ball bouncing. I tried the ball bouncing one and got two bounces before my jaw locked up and I bit off a piece of my tongue. I dunno, maybe I'm just not ready for cunnilingus.
Thanks to TBTMH, who agrees the key to pleasuring a lady is spelling her name over and over again with your tongue in different fonts (I suggest wingdings to really drive her wild).