Turn on or what? Wow, the thought of wet panties would turn most guys on. As James also says "the pheromones!" So long as you are a clean hygienic person, those natural juices and lubricants are the stuff to make a man go weak at the knees. Cosy up next to one the next time you get moist and see if nature hits his senses. Even better, if you are horny for him place his finger there to let him know. If you don't want him but are still wanting, discreetly play with yourself and take solace in the power you have to send him wild with a desire he's not even aware of. Let the pheromones do their work, lol.