Not sure what you're afraid of. D: If it's porn that's.. sorta happened already due to the texture mods out there. I wouldn't worry about it, people are just gonna do that kind of thing. There's the potential for.. creepy applications of that though so that I do understand... I'm more interested in porting characters to other games, myself.
Heads are named like pl_hd_etc. Problem is is the current AQP parser crashes when it attempts to parse a few of them. I haven't looked at the old AQP format to really understand why (it uses a tagging system similar to the cml files. Newer AQP files use a pointer table instead).