Sexual fetishes / kinks / paraphilias can start young, often as a result of early experiences.
They tend to affect males more than females, says Psychology Today: www.psychologytoday.com/gb/conditions/paraphilias
Menophilia is the fetish where the sight, smell, feel, taste and thought of menstruation and blood is sexually arousing: www.period.media/tag/menophilia/
Menophiliacs will raid sanpro disposal bins searching for bloodstained towels and tampons to wear.
There are online conversations describing these urges and experiences.
Yet another reason why males including young boys should not be given access to women's private spaces and experience.
Those unisex loos with urinals and sanpro bins must go.
Last summer I saw three adolescent boys daring each other to sniff the contents of the poop scoop bin in the park. They did it.