What lubrication is best for conventional penis to vagina intercourse. I've seen some commercials lately that advertise KY jelly lube and some other ones that heat the vagina and create sensations that makes sex feel better for her. Just wondering if this is true or are they just trying to sell a product, you know like those stupid excecise commercials that promise you that you'll look like the person in the commercial in less than 24 hours. Also asking, because I don't have a vagina.