 So the Kamasutra talks about the importance of kissing games, not just kissing, kissing games during foreplay. So for instance it says one of the games could be where you layer bet on who amongst you using lips only can first capture the other one's lower lip. And then it goes on to explain how both the person who wins and the person who loses should behave. So it says that the person who loses should sulk. They should say this was unfair, you cheated, I want a rematch. The person who wins should initially refuse, laugh and tease their partner for a little while and eventually agree to a rematch. This time the loser should watch carefully and then catching the person off guard should quickly seize their lip in their teeth and then holding on tight should say now I have won because this time it was a fair contest. And it says hold on to their lip laughing all the time and threatening to bite if they try to escape. And it finishes by saying that you should invent other kissing games like this with both partners, the loser and the winner, behaving in exactly this manner as has been prescribed because these games greatly arouse desire and prolong the pleasure of love making for hours.