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Well, legal matters also require determining rules about Pokemon classification in species. Simply put, sex with one type of Pokemon would likely be more acceptable than another. For starters, let's just assume that sex with Pokemon that have evolutions but are at their base level is shunned upon. Final evolutions are far less taboo, and sex with middle variations are situational. (Metapod is more taboo than a Charmeleon, for instance).
However, dividing into species is difficult. The rules of Pokemon make any Pokemon able to breed in two generations. Given that, the new rule is that a egg group is a species by its first group, and are only part of the same species if the first and second are reversed elsewhere.
That is 12 species, but we CAN go smaller.
Water 1, 2, and 3 divide the water based Pokemon into Terrestial Lizard/Mammal, Aquatic, and invertebrate. Water 1 the others in them as second egg groups, but as this is the only place they cross, they are separate. However, this does give us a second place to combine. Water 1 crosses with Dragon and Monster the most, and like them is terrestrial-based, so a general connection would be to place the Water 1 egg-group into the Monster and Dragon type.
Water 2 is the aquatic type, and large enough a variation to be considered it's own type, so that stays, but Water 3 as invertabretes could be combined in a similar fashion with insects, so the Bug and Water 3 are part of the same Egg Group.
Finally, Amorphous and Mineral follow similar patterns of being Pokemon based in elements and inorganic material, so from there we'll add those two together.
So, the new variation is:
-Ditto
-Monster/Dragon/Water 1
-Bug/Water 3
-Flying/Field
-Fairy/Grass
-Human-Like
-Mineral/Amorphous
-Water 2
-Undiscovered
Eight specific 'species' of Pokemon to examine in sexual mannerisms. So now we can begin to construct patterns of intelligence, intimacy, and 'compatibility'.