OK, let's clarify categories and their names once and for all to avoid any misunderstanding.
rest: rest_bed, rest_onsen, rest_garden, rest_beach and so on
blowjob pics: bj_deep, bj_titjob, bj_lickjob
normal sex: sex_69, sex_doggy, sex_got
anal: anal_69, anal_doggy, anal_got
lesbian: <------- which subcategories here?
mast for mastrubation
bdsm: <------- which subcategories here?
group: <------- which subcategories here?
a couple of battle sprites
profile with optional subcategories profileneutral, profilesad, profilehappy, profileangry
schools: dance, maid, etiquette, beauty, combat, (XXX = any sex pic, isn't it?)
shop for shopping
club for waitress (= maid school, isn't it?)
date, date_beach and so on
ent for entertainment (girl having fun of any kind or what?)
strip for striptease
Anything else? Like clean for cleaning (those pics are very rare even for popular characters)?
And do we still need quest sprites for each character? I doubt each of them will have a personal quest, after all. Or I'm wrong?