The maths on the Paul McCartney-Heather Mills divorce is as follows:  

After 5 years of marriage, he paid her $49 million. Assuming he got sex every night during their 5 year relationship (which would NOT have happened!) it ended up costing him $26,849 per time.  

On the other hand, Elliot Spitzer's call girl, Kristen, an absolute stunner with a body like no other, charges $4,000 an hour. For anything!  

Had Paul McCartney 'employed' Kristen for 5 years, he would've paid $7.3 million for an hour of sex every night for 5 years (a saving of $41.7 million).  

Value-added benefits are: a 22 year old hot babe, no begging, no coaxing, never a headache, plays all requests, ability to put BOTH legs around you (!!!), no bitching and complaining or 'to do' lists. Best of all, she leaves when you're done, and comes back when you ask her. All at 1/7th the cost, and with no legal fees.  

Sometimes renting makes far more sense.