What is the ruling on a husband sucking his wife's breast if it contains milk, given the existence of fatwas that prohibit benefiting from what comes out of a human being?

It is permissible for a husband to enjoy and suckle his wife's breast, even if it contains milk. However, it is preferable to avoid suckling if it contains milk, to avoid the dispute regarding the impermissibility of adult suckling. The claim that it is forbidden to benefit from everything that comes out of a human being is incorrect, as evidenced by the permissibility of benefiting from milk.