One of my best friend (male,) wears female underwear like bras, panties, camisole. He is straight and no sign of being gay?

Is he normal? he wears bras 24x7 under his normal cloths. He says he loves women body so much that he likes to celebrate. He has a girlfriend and he has active sex life and happy too.
One of my best friend (male,) wears female underwear like bras, panties, camisole. He is straight and no sign of being gay?
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