Apr 17, - Research says the average length is inches for a flaccid penis When it comes to sexual intercourse, bigger may not always be better.Research · Does size matter? · How to increase size · Outlook. A GRAPHIC has revealed the average size of a man's erect penis from all over the What are the largest erect penis sizes on average around the world? . I was big in that department and played football as a defender, the point being, well thats bonkers for a start. a LOT of black men are over 6 inches.