Well I can see jewelry being the sixth option for female Draken. It has some sensibilities in a lore kind of way. Someone mentioned earlier that female Draken sound regal, which could also mean that males have to impress them quite heavily in order to win their affection. Maybe finding the spoils of war (in this case I guess a giant hoopring?) is another means of doing that. Based on this http://youtu.be/AYDLGzNprDU?t=4m54s It looks like the females don't have a sixth slot implemented, of course this is pre-beta, and much can change between then and release. Jewelry seems like a safe option as opposed to breast size. They could also make the sixth slot effect the hair in some way, like beads, adornments, ribbons, not very savage but it's late and my thinking has went out the window!