In ideas about bodies, mind and body are difficult to separate. It is not true that the only kind of body you can discuss is the kind you have.
Men can, and do, defend women's bodies, both online and in real life.
It is not, should not be, the sole responsibility of women to speak for the integrity, protection, and autonomy of the female body. Donna Haraway says that we now must be neither woman nor man, but cyborg. The cyborg is a kind of disassembled and reassembled, postmodern collective and personal self. This is the self feminists must code. The parts of a system are not separate from and independent of one another, and neither are women and men.