Going from woman to man at the beginning is to show changing personality.
Because doing something sexual as a man originally should be way bigger internal straggle.
He/she has an insane body that attracts men, but he/she does not like or want men one bit at the start.
This is not just going from modest girl to corrupt slut. This is going absolutely against your true original nature in heterosexual contacts with men as a woman now.
As with girls — it's whole different dynamics. It's actually giving them to him/her in a way he/she could never have imagined before. Honestly, not a fun of lesbian action. Too boring outside the first one or two encounters. But sex with men, especially more deprived and group sex with men, is way more interesting.
Some on Patreon criticize the usual “become a slut and fuck every dick” trope. If game will follow it.
But this is the most intriguing, the best part. The game will be totally wasted if it will not follow this way. And most patrons and other users in general agree, they want M.C. action with men the most.
As M.C. never originally wanted or even ever imagined something like this. This is a conflict, internal struggle, mental reflecting and bending. M.C. pushed by society, world, and his/her own body to do unimaginable things.
So, “become slut and fuck around” has a huge meaning and way better if M.C. is male originally. Because other way it would be just usual boring “let's fuck more” corruption. Just like some “let's fuck more (girls)” harem games.
No conflict, no real struggle at any point. No real growth, no fundamental challenging and changing. With originally girl M.C. (non-N.T.R. or other heavy stuff like B.D.S.M.) it is just “oh, fine, to hell with all, I will fuck more now” — end of story. Just jumps from one penis to another faster.
That is why N.T.R. and game like this one is way more interesting. If they have psychological reforming. Moral internal struggle. Different parties (husband/friends/family) having other view and other desires, contrary to M.C. female. Or M.C. male getting cheated by female - netorare, or discovering together how deep is the rabbit hole of netorase. This is just way better, way more interesting setup and genre than boring “let's fuck more” (basic corruption out of nowhere) for female M.C. and harem games for male M.C.