That's basically what I suspected.
Is this Hyao's way to punish heavy cheater, as you can't get Lv100 + all attributes over 50 otherwise.
But I don't get why he's trying to punish someone being too slutty. Someone could easily get fucked more than 100 times if they grind long enough.
Or you mean "ALL" holes be fucked more than 100 times, but is fine if only your dick / asshole is used more than 100 times? Then the former also only happens to heavy cheaters.
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Btw, this also makes the "bonus on equip-able item" cheat someone mentioned more smart, as you can disable it at will