When it comes to sex we all want to feel like we are desirable and able to please out partner. At 74 y/o I yet to find that the size of a man's dick matters but what does is the way a person sees his or her self. If you obsess with your dick then you probably won't satisfy or even enjoy it yourself. My suggestion is fuck like you have the best cock there is or like this is the last fuck of your life.
