Ummm I didn't think I'd have to get this graphic but... If you have breasts (either man-breasts or the more preferred female breasts) then your nipples aren't flat on your chest. In fact they are the most prominent elevation of the entire trunk. (Have you seen a woman in profile, or are you too young to be on the computer without parental monitoring?) Therefore the bibs will stretch away from the torso while pressing firmly on the nipple. Can you picture this yet or should I go on?

PS KY is water soluble. Dries up and disappears real quick. Vaseline on the other hand is a petroleum product and will ruin the integrity of condoms. Don't mix them up! They're not interchangeable!!