亵 rarely stands alone — you'll meet it inside compounds:
亵渎 (to blaspheme/profane),
猥亵 (obscene; to molest),
亵昵 (improperly intimate). The
衣 (clothing) component reflects its original meaning: 'underclothes' / 'home clothes,' i.e. private things — and from there, anything that crosses the line into the indecent.
