Craft Armorer makes bondage gear.
Well, some things are more optional than others, and the authors of the BEF use Appearance as a reference in a significant fraction of the rest of the material.
With the DMG's Adept spellcaster, the hole was at least addressed, but hardly filled.
For my money, I wouldn't try to push a controversial age in the game unless all the players were legally adults in MY culture - and maybe had signed waivers.
In such cases, even if graphic description is involved, an element of chance might prove to be important.
Charisma based, Class skill for everyone, can be used untrained, synergy bonuses from or to bluff, disguise or diplomacy.
One option is simply to average Charisma with some other ability score to generate a number as needed.
All of this and more await you inside the Book of Erotic Fantasy.