What do you think brought you to this fetish?

I’m not asking what event triggered it necessarily, but more thoughts on psychological factors involved.
I’ve put a lot of thought into this since my early teens and don’t feel like I’ve developed any kind of insight. A lot of “academic” source I’ve found seem to assume trauma as a major factor, but I can’t say thats true for me or anyone else I know, and given none have provided sources for this irrelevant of the prestige of their publication, makes questionable about any research that has been done (although I would be very happy if someone knows of a paper they thought was useful).
I’ve seen a lot of people imply a level of gender dysphoria as a factor, which does feel more accurate to me but I’m curious if people have found this to be a universal experience. Although I’m not sure I understand how this feeds into the fetish exactly, is it just by being reminded and disappointed at being at having male genitalia? Or is it a result of the juxtaposition between (perceived) normal gender dichotomies.
I know for me, although I’m bi, I only find ballbusting arousing by women, but I know this isn’t true for a lot of people (I know some straight men who like being busted by other men but don’t find them attractive).
I’m also curious about women’s expresses. Obviously less women are into the fetish than men, however since some women are into it I’m curious if their experiences broadly are the same, or if its basically just a different fetish that happens to overlap.
I get there’s not going to be one experiences, and particularly since testicales can be metaphorical for so many things, form maleness, strength, reproduction and, anxiety and weakness, so people ‘in’ will be very different.
Idk, sorry this is so rambly and disjointed, It’s frustrating not understanding something so basic about yourself and I’m curious about other peoples takes.