Cumsluts without the dumb4cum perk get the scenes written for characters with the Nuki Nuts perk, which don't make much sense because they're like this:
Now this... this is a bubble! It’s full of exactly what you’ll need in order to fill your [pc.balls] up until each ball is capable of putting this thing to shame.
I know it was coded the other way from the beginning, but given that they have additional effects (mostly +lust), maybe nuki scenes should have the priority for nuki nuts + dumb4cum/cumslut characters.