Might just remove the dick sizes from all chara profiles and let players fantasize about the actual sizes in their mind xD (since I'm bad at gauging dick sizes anyway...)
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Lol, it's one of those things you put way later instead of the beginning. I think it's still nice to have them, but it's decided by observing the reaction/common consensus within an established fandom. Usually body size, age, personality, and who people prefer as top/ dominant /"alpha"/how versatile they are determine the characters' perceived size.