Valve also requires devs to note that any characters engaging in such situations are age 18+.
which brings the old censor go around, just up the age of the character to 18 in their profiles
if they have to.
but
bouncy games such as the Senran Gakura series, they just choose to remove the age on the character profile, and keep the game as unedited and original as they can. (side note, there is a senran gakura coming out for the switch.)
VN's (and similar) have been witch hunted before, regardless if they have a +18 mod/patch or not. not because of the characters, but because it was easy to access (they where told not to provide patch links in each game's discussion boards)
just because these games don't come from big game studios with money, they think they can just come in and push them over.
idk, it is nice having VN's and such in steam, smutty or not, instead of having them imported or bought at expensive prices.