Is wearing bra by men good?

These days my boyfriend has a habit of wearing bras. Initially, he used to wear my bra sometimes. But these days he wants to wear everyday. He has now bought few pairs for himself. I do not know why does he do so. He is straight and no sign of gay. Still he wants to wear bras everyday.

Any suggestion how to stop him to do so?
Is wearing bra by men good?
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