I've faced a question like this in real life as my best friend is a straight guy, formerly in the army, who is 6-3 and weighs 215 pounds, but who is married to a Chinese-American woman who can't be any taller than 5 feet and who probably weighs 80 pounds. They have five kids and he claims they have a great sex life so I guess there must be some way for big guys and small woman to enjoy sexual intimacy with each other. He claims to be seven and a half inches, too. I have no first-hard evidence of that, unfortunately. This guy is 42 but he has a better body now than when he was 22! He says he just has a great metabolism but I think he must hit the gym more often than he lets on.