Early humans were HUNTERS, GATHERERS and FISHERMEN. Pimping and whoring only started when there was excess time and money for such nonsense. The early humans didn't have any spare time.
After hunters, gatherers and fishermen, the professions of healers and cooks probably got their start.
Some people have no common sense.
Haven't you ever invited a date over for a dinner of broiled salmon in hopes of a little affection later (around bedtime)?
No money changed hands and there is always time for affection.
Whoring around was a lot easier when all it took was a club to the head.
My understanding from Archaeology class is that some did, and it can be determined how much free time they had by the quality of their artifacts and tools.