Hi Eddie, some of these may fit to the scenario...but in different ways, it takes

context to use them.   Let´s wait the others participants improve, change or even

deny my remark. That´s all for the time being.

    'Rabo de saia' would be 'any available woman'.

     PP.

He is a womanizer
He is a serial womanizer (and can´t help himself).
He is an incorrigible womanizer
He´s obsessed with sex (but, then maybe completely uninterested in his partner)
He is addicted to sex/he has a sexual addiction.
He is compulsive about women...
He sleeps around.
He can´t help pursue women.
He goes to bed with any woman in a whim.
He has an hypersex drive.
He is overly sexed.