Thanks a lot!They're the same jump except the take-off edge, and most men are stronger than women so they don't tend to have issues with the lutz so much. Rolling the edge on the flip can prevent you from overrotating the flip as it blocks the take-off just a little. However, for women they typically can do flips more easily due to the take-off being less blocked than a lutz, and the fact that their legs aren't as strong. So, they may do good flip take-offs, but turn the lutz into a flip to make it easier.
Most women don't jump like Ito, Slutskaya, Bonaly, or Kim. But lots of men can get that high so the harder jumps may be easy while the easier ones can sometimes be a bit too easy. Their bodies counter this by making the flip harder, while most women will counter that by making the lutz easier.
It's a muscle memory issue, really. Sometimes you can consciously train to take off the wrong edge. Sometimes the body has to go back to square one and train the jumps up from the beginning to relearn the right take-off (I think that's what Joannie Rochette had to do, the latter).
Another thing that has led to a lot of edge calls on both Lutz and Flip is the obsession with taking shorter take-offs into them out of steps. IRT the flip, a lot of people have too straight a take-off, so they can never really get on a secure inside edge and that straight line gives their edge a high probability of rolling over to an outside edge when they try to apply edge pressure to the skating foot.