Yes, I mean, I am making the game so of course I remember...
Most creatures will fit in the Large, Medium, and Small sizes. The last two are for special creatures.
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Sorry you're not making any sense here. The player can feel whatever they like when they meet the monster girls of different sizes. Be that awe or shock or horniness. That's is for each person to decide.
As a mechanic size changes the animations the monster girl can use with monsters of other sizes. Please read of dev logs for information on this.