Special Agent Tanners is an undercover agent of the Dhorn Empire, who seeks out and arrests prostitutes. He is disguised as one of the sailors around the harbor of Betancuria South.
Spoiler: If the Princess engages in various sexual acts with the sailors, she will likely be confronted by Agent Tanners. He can be persuaded to let the Princess go, in exchange for various favors, including offers of free sex anytime it's wanted. If he agrees, additional Dhorn soldiers will interrupt and attack both the agent and the Princess.