pwnage, due to the very "in development" nature of OA project, I fear some parts of the game may remain obscure to you
If you want to learn computer science, have an eye there:
http://en.wikipedia.org/wiki/Apache_Subversion ; you'll learn about what checkouts are. (they are just gathering a whole directory structure, their files, from a repository).
If these nude textures don't come with OA, I may make a .pk3 from it and host it. It's more player friendly, adult players aren't necessarily geeks.
Edit:
Then your dreams come true:
http://download.tuxfamily.org/openarena/files/pk3/uncut/z_openarena-uncut.pk3FYI, (running Linux):
$ svn co http://openarena.ws/svn/packs/uncut
#delete these annoying .svn in every subdirectories
$ zip uncut.zip -r models scripts sounds
$ mv uncut.zip z_openarena-uncut.pk3