Good, this is why I personally wouldn't allow any form of mature RP, but at the same time, I don't want to condemn them as a collective to having nothing to support their... endeavors I guess, I just don't want it to be something you find on a whim... The issue with it being in the party finder is that it is in a public space for everyone to see; be it solicited or unsolicited. Reworking the fellowship finder would allow you to fully customize your advertisement and mark it as 'NSFW' potentially. My issue pretty much entirely stems from:
#1 - Advertisements through the party finder are entirely unsolicited; that is not to say they aren't welcome, especially in the lighter form. But mature RP definitely doesn't belong in a public space, especially when the game has been designated for minors, essentially.
#2 - It is in a public space.. Goes back to the previous point really.. But to seek and find is one thing, to not seek and find is an entirely different issue.. If people seek it out then that is on them; they should understand the implication and it is generally seen as.. Not something a minor would do; on the other hand, not seeking and finding opens up people, be it mature folk or minor folk to vulnerable situations which can have significant implications, even if just online. If people see something they will want a piece or to try it, irrespective of the implications it may lead to. People are rebellious by nature, especially younger people.
My argument is that mature RP should not be in a public space where you can 'find but not be seeking', especially when it pertains to how accessible the Party Finder is. That is not to say it shouldn't be welcomed, but it should be behind tighter doors. - Sure, parental controls would help alleviate the issue, but it'd for sure be a complex endeavor to incorporate it
Just comes down to reducing the exposure that people will have to mature content 'involuntarily', and putting the hammer down so to speak.