There are a total of 25 scantily clad maidens, each of which each grant you a bonus in experience when you rescue them. Below are the names of each stage and the corresponding amount of maidens located in them.

Chance Meeting: 1
Devil Island: 2
Elephant Graveyard: 3
Fallen Kingdom: 3
Pirate Raid: 2
Midnight Raid: 2
Outpost: 7
Tribal Warrior: 3
Well of Dreams: 2