
I don't think he has some mental condition, he just had his sexual awakening young and that's nothing wrong with that. Then a pervert did those disgusting things and put the blame on him, a victim, who grew up to believe he was the wrong because he was sick or something. If the author wants to patologize him and his sexual e behavior (even if yes, it makes him suffer), that'll not be right man...

no he did feel pleasure from a young age but was abused and manipulated for years. that’s why he believes he was “born a slut” and is hyper sexual now, it’s due to the trauma that he experienced from a young age. technically it would be a mental condition because of the trauma, tho he’s navigating through it now and trying to accept his hyper sexuality and overcome the trauma
would hypersexual be the right term to describe his condition?