My guess is based on the number of bedicked characters, the average size of those dicks, the popularity of those characters, the tendency in new content development and feedback about it on the forum. As well as in general Champ has more opportunity to be a catcher rather than a pitcher.
So yeah... I think it's safe to say that a large number of players create PCs that are really like big dicks.
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There are more female characters without dicks than female and male characters with dicks combined. If you only count characters that you can actually have sex with, the proportion increases in favor of female characters without dicks. Put another way, Champ has
far more opportunity to be a pitcher than a catcher. That proportion has not been changing to any significant degree over the last few years. There is a convenient tally located
here. (Technically it doesn't account for the fact that, say, Tarandra doesn't pitch, only catch, but it's a reasonable guide to the proportions.)
I would agree that the dicks in this game tend pretty big, and that the characters who have them are often popular, but would also remind you that characters
without dicks are
also staggeringly popular - Kiyoko, Brienne, Cait, Elthara, Mikoto, Cassia, Atani, Ahmri, and so on. Hard data on player preferences is a few years old, but the most popular companion last time there was a poll was Kiyoko, who doesn't even work as a companion if the PC doesn't pitch.
Also, it's still quite a hop, skip, and a jump from "more than half the people here are [...] slaves to big dicks" and "a large number of players create PCs that are [sic] really like big dicks". You dropped the proportion and omitted the "slaves" part - bearing in mind that much catching content is not subby in the slightest (see e.g. Etheryn or Submissive Arona). You also dropped the reference to bimbos, and despite the lack of hard data I would wager that most players do
not play as Bimbo Champ (even though she is the bestest and loveliest of all the beans).