I just started and I still have not had a chance to roll with a girl because I don ' t trust myself to either come off like a total wimp or a total creep when I do . but there is no doubt in my mind that all the women in my class would be able to submit me . then again , I ' m a pretty average to weak guy . I remember watching a video where one of the gracie brothers on youtube explained that every 20 pounds you have on someone is a belt . and so I think that if I hadn ' t spent the last 3 years of my life studying for a degree and having surgery every 6 months , instead of being a 70 kg guy with about 10 kg of flab , I would still be around 70 kg . but those last 10 kg would be muscle and bone mass instead , and I would be fairly confident that I could beat the 50 kg female blue belt in my class . its almost like wrestling with a 12 year old , you can just throw them off . I think even though it sounds like they are shitting on BJJ , I don ' t think they are , they are just stating facts . just because a really big guy can beat a much smaller female doesn ' t mean that BJJ isn ' t effective . it just means that the much smaller female needs another belt . that ' s what makes BJJ effective . and I think everyone understands that . but they do still tend to exaggerate and circle jerk . also it probably confuses people that even though women tend to be less coordinated than men . BJJ is not like football you are performing complex body movements . in my opinion it is closer to dancing than to a ball sport . and guess what ? 95 % of dancers are female . so I think people tend to have a slightly more misguided view because of this . also I guess a lot of people also need to take their free class and bring their expectations of themselves down another notch .