Numerous documentaries on transgender over the years had the men saying they still wanted women, transgender men frequently become “lesbians”, Bruce Jenner has stated be was NEVER attracted to men.
Thinking you are supposed to be a woman is a separate mental issue from thinking you want men sexually. Also we are talking about preteens and teens who are experimenting with sex. No reason to believe kids of opposite sexes with opposite genitalia won’t screw around in showers in school.
Very few transgenders ever change their genitalia. What did you think transgenders do with their penises, did you think they are all gay men? They are not.
Surely you can source the “numerous documentaries”