I just learned that as a start to my new year this year.... They are breeding such creatures by the millions anymore. Like a cancer to all womanhood. Better to just live a life of a bootycall bachelor til Viagra stops working. Then end it all with an awesome drug overdose so as to not be a burden to and family left behind during old age.
Oh, and the upfront thing always is best in that situation. Stringing her along just makes her attachment even stronger and when it does end you end up with some psychopath doing whatever her imagination can fathom.