I don't much about Dynamic Hair but since no one has, I'll chime in with my experience. I've found that dynamic hair will intersect the body every chance it gets. The only way I've found to keep it from happening is by styling it manually. Not fun, but hopefully someone with more experience may have a better way. I've tried collision detection and all with the same results, intersection. Dynamic hair it appears was designed more for movement with atmospheric effects more than for stationary posing. I could be wrong and have been doing it incorrectly but that's my experience. LOL