Now, not all whores are prostiwhores, but all prostiwhores are indeed whores. As well not all prostitutes are prostiwhores, but all prostiwhores are indeed prostitutes.
That being said, the prostiwhore is a completely separate entity that stems from being both whore, and prostitute. A whore will sleep with anyone, a prostitute will sleep with anyone that pays. BUT a prostiwhore WILL sleep with anyone PROVIDED you buy them a couple of drinks, dinners, or a slurpee at the nearest 7-11.
Prostiwhore - Any girl you have ever dated........... and quite possibly your wife, if applicable...... but definitely your ex-wife.... no wait... she is just a whore