I think I can settle with this idea/explanation. In Sammy's situation, I suppose their gender Identity does kind of fall down to their time and experiences with their new body. I just enjoy the philosophy/thought experiment of Sammy's unique situation, as in reality, as far as we know, no one has ever transitioned to the opposite gender in the way Sammy has.
I hope in future versions of this game, we'll get to see more of Sammy's (mtf) inner thoughts and see them notice the changes to their own mentality and reflect on them. Perhaps something like after a certain time and certain events, they (us the player) choose whether or not they want to slowly warm up to becoming more feminine, or if they'll firmly hold the belief that they're a guy, and will even flaunt that fact publicly (with all of its consequences in doing so). Perhaps even go in between the two and be just a guy that's playing the part of being a woman publicly to deceive others, but still acts and talks like a guy when in privacy.
I'm sure that's how it is in the game, but personally I just see it as Sammy's personality ONLY changing based on decisions the player makes for sexual encounters, with nothing else really having a notable affect
But then again, this is a porn game, and we're here for that and for fun, and I'm just trying to make things more complicated lol. Anyways, this game is a 10/10 for me, and I look forward to the dev reaching their finish line