Below is a review of the "Sonic Sex Change" mod/concept based on its implementation in fan projects: Review: Sonic Transgender / Gender-Swap Mod Concept & Impact
As a fan mod, it may occasionally clash with certain cutscenes or official DLC. sonic sex change walkthrough
Below is a general walkthrough of the themes and mechanics often found in these types of fan-made experiences. Concept and Storyline Below is a review of the "Sonic Sex