No one really wants to have sex with five, ten, or twenty strangers a day, every day. Besides the sheer numbers involved, some of those strangers are going to use a person in ways that are bizarre, painful or disgusting, and occasionally fatal.
When people who have worked in prostitution call it repeated rape, they are not exaggerating or being "hysterical." They are being legally precise. Rape is sexual intercourse, against the will of the victim, carried out by threat or force.
In prostitution, the john performs the sex act with the unwilling victim, but subcontracts the intimidation and violence to another man, the pimp.
The john would like to believe he is paying for sex, but the person he has sex with gets little or none of the money. The money goes to the pimp to pay for the force needed to keep prostituted women and children working. It goes to the drug dealer who provides whatever it takes to keep the workers from becoming psychotic or committing suicide. It goes to pay the businessmen who provide the real estate, support services, and legal protection for the trade.