Figuring out your why for PMO

Hey guys so I read tfm and read the pmo freedom model book too.It says you should figure out your why to using porn. If anyone has figured it out, how did you do it? As in what were your starting points of analysis and frameworks, events used to get to your why?

I'll even add some specifics as to the type of videos I watch if it can give additional context:

1) POV based videos and BJ and CIM sections (had the experience once, felt good physically, mentally tho umm can't explain it. Just felt normal after that instantly

2) controlling the head while the image/video is performing the oral act/bj on man

3) the man in the act and his skin tone (of his genitals is similar to mine), then I'll watch it more and fantasize more