I spied an advertisement

I am not sure as to what exactly it meant

a job vacancy for support/caregiver work

but implying that Women need only apply

I supposed that possibly their clients were mainly women..??

Do they not need strength to lift and support, to sing, to charm, kindness and great knowledge and interests in social sense, If a Guy were to apply for this job, what would the problem be?

Please someone tell me if I am wrong but is it not discriminative to state that a job is best suited to a female, I actually thought it was made law long ago.