The fiasco at UPENN has many tentacles, but Will Thomas aka Lia Thomas, a man who was allowed to “identify” his way onto a women’s team and into a women’s locker room very likely has a sexual fetish. He gets aroused when people pretend he’s a woman. Knowing and understanding this fetish will help people understand a significant subset of the straight men who decide to transition. Here’s a great article with details.
People transition for many reasons, and those vary among homosexuals and heterosexuals, those with autism, and those with other co-morbidities. If you want to understand the gender ideology phenomena, it’s best to look beyond the “born in the wrong body” trope and seek the individual’s reasons. It’s always eye-opening.