Well, to answer the questions mentioned by you (butt sweep and sitting) it's not so much that men are imitating female mannerisms as it is that we functionally have come to the same solution on some issues and different solutions for other issues.

Take sitting for example. Without a butt sweep you will often sit with your bare bottom (or undewear) directly on the seat. This will lead to a wrinkled kilt or discomfort (especially if you are going regimental and sit down on a black leather car seat after your car is sitting in the hot sun on a 100 degree summer's day for several hours). So just like skirt wearing ladies, kilt wearers have found the butt sweep to be a necessity. Now, you don't have to do a butt sweep in a lady-like manner, nor even do it two-handed. I have to walk with a cane, and I definitely need the extra support while sitting, otherwise I'd just fall backwards onto the chair, couch, etc. So I do a one-handed butt sweep. It means twisting the upper body more to the side and reaching farther under your posterior, but it does work. I've also been told that it definitely does not look lady-like at all, in fact one female friend says that I definitely turned the motion into a masculine action (although she meant that in a derogatory way).

As for sitting, men in traditional kilts definitely have not solved the problem of exposure in the same manner as the women folk. For ladies, the skirt tends to be more fitted to the body and of lighter material. As such, the only way to avoid views up the skirt while sitting is to either wear a skirt that is longer than knee length or to cross your legs.

Well, for us guys we don't wear kilts that are longer than knee length. And crossing legs is just not comfortable. Thankfully our kilts are much more voluminous and much heavier. Plus, we have the sporran to aid us. Once you've done the butt sweep, sit and spread your knees wide. Not only does it feel truly manly to sit in this manner, but it leaves room for your sporran to fall between your thighs, force the kilt material down, and close off the view up your kilt completely.

It's all a manner of finding a functional solution to a given problem, and has nothing to do with wanting to imitate a woman or not.