There are a lot of MMD videos made by female Japanese MMD fans which would explain the use of male models.
I just wanted to say that in my first few months of working with MMD/MME/PMXE, your tutorials and other MMD related things have helped a lot.
I do have one question which I hope you can answer.
I'm making a few models now, but I find that in posing them, their ankle bones aren't "connected" correctly. Does that deal more with IK bones or physics, or both?
Please advise, thank you.
Several things can be happening when the ankle bones separate from the mesh. But, I would tend to look at the weighting of the offending bones to the model's mesh before anything else. Have fun re-weighting >< ...
The other possibility is that the length of the leg bone is either too short or too long and is stretching the mesh and causing the derps. This fix is easy; adjust the position of the ankle and other leg bones as required. If your model is wearing pumps, this is usually the cause as the previous editor wasn't paying attention.