Is it just Ditz speech or is your Steele a Bimbo? if so then a few below that i know of from experience. I don't think there is alot, mostly just the dialogue changes.
Anxyine - you find her on Uveto.. she calls you a dumb bimbo.
Zephyr - New Texas.. comments on it if you took the treatment and you automatically suck her cock clean.
Kally - Canadia, if you're a bimbo, you can crawl under the bar and perform oral on her.
Mitiz - one scene for bimbo Steeles.
Bianca is an NPC that won't sex Steele if she has the ditz speech.