My boyfriends feelings get hurt when I ask to use lube. He feels like he's not turning me on enough, like he can't get me wet on his own. When in reality, he totally turns me on. I'm a smaller girl and he's pretty well-endowed so when we go at it sometimes I could use a little extra help from lubricant. How do I get him to switch sides and assure him he's totally hot enough for me?