I have seen overweight guys have sex with gorgeous woman.
Of course the guy can. It has nothing to do with the weight it has to do with how you project yourself. This "guy" needs to be confident, consistent, have purpose, and be focused. I think once he gets a grasp on those traits it will automatically take care of the overweight issue, in that he will start taking better care of himself. Which will make him more aesthetically pleasing to the opposite sex (another alpha male trait). ^_^<br />
Just my take!!!!
It's your mindset that makes you an Alpha male.