Anyone can handle loads of G while fully reclined, like an astronaut. The issue in fighters is that G is directed in a line from your brain to your rear, and under G, the blood leaves your brain and flows downhill. You pass out.
The blood will leave your brain at about 4 G. A good G suit is worth maybe 1 or 2 G, no more. What keeps people conscious above 6 to 7 G is the L-1 or M-1 strain maneuvers, in which abdominal muscles are used to move the blood back uphill. This requires a lot of muscle mass and strength to do successfully for any modest period of time. And in general, men have stronger and thicker muscles.
I never said women can't do it, I said they don't have some magic advantage, despite the German study. If I were to guess, they took random people from the street and put them in a centrifuge... people who were not trained. The difference comes in training. When men work muscle groups, they get stronger, thicker, faster, than women, and a trained male is going to have more endurance, and be more effective, in moving the blood uphill against high G forces.