Hmmm if i understand well your a , b , c , d thing , everybody will have a pose every 4 months or more ?
I assumed girl-with-strapon could be interchangeable with a shemale ( no we cant switch with our shemale partner with or without strapon ), I think its relatively fair in terms of the user amounts. For example, we really don't need an MM update every month because that's the smallest demographic ( hmmm i think its how dev team is thinking about MM too , the result , i think they got 1 pose in 2 years) on this game.