Birmingham police raided a massage parlor Wednesday.   Officers burst into the VIP Spa on Parkway East.  Police say it was a front for prostitution.  Four employees were arrested, along with three customers. "Anytime that a female is put in a position, where she has to sell her body for money, that's a problem ... and we're not going to allow it to happen in Birmingham," said Lieutenant Ron Sellers is with the vice squad.  Authorities say sexual favors, referred to as "happy endings," were offered for $100.   It was the third raid in the area, which has been plagued by prostitution.