It may just be me, but I think most of us think the same way. When we taste tongues and we start to kiss we get turned on. We will get addicted to it and all of us with make out for such a long time. What is it about tasting tongues and those lips that make us do it for such a long time? My girlfriend and I french kiss for up to 30 minutes straight. Then we usually get turned on and have sex right after we make out.
It might be because way you move your lips and tongues gives a hit of how you might please each other during sex