Reminder that vtubers who refuse to homocolab are likely doing so because they have a boyfriend and they are controlling/jealous.
Their boyfriend probably makes them do the vtuber voice and cosplay for sex as a power/domination move, I certainly would.

vtubers who do not refuse likely are "single" e.g. only do hookups/fuckbuddies, and the men who fuck them probably don't know or care about the vtubing element, so there is less humiliation involved for their male fans in a way.