I’m not sure you can get to there from what I said - but I know for sure that upon puberty I had no choice at all in the fact that I found women attractive and breast motion hypnotic.
Fixation upon the same sex does happen in animals, and IIRC it is more common among species that have a large overlap in sexual dimorphism.
Males of our species tend to be larger than females - but there is a wide overlap. Some think men and women’s secondary sexual characteristics are to obviate that and make it more obvious that the bearded individual with wide shoulders and narrow hips and hair on his body is male and the individual without a beard or as much body hair and with wide hips and developed breasts is female.
Keeping kids going through puberty in sexual isolation from opposite sex peers also tends to confuse the issue. It is more difficult for a young man to “imprint” upon females as desired sexual partners if they never SEE female peers.
Just my 0.02$.