A man who has sex with lots of women and isn't too fussy about what they look like?
:):) That`s great, what made you think so? :):)
that he's irresponsible/lazy/doesn't pull his weight?
yes, a man who behaves in an immature way, I suppose that idiom used to be longer in the past, sth like: such an old horse but so silly.
What does it mean to call a woman a 'paper hanger'?
Opps, I translate it into papierowy wieszak, wieszak na papier
but nothing comes to my mind .