Episode 32 of "Farscape"
s02e10 My Three Crichtons
Title: My Three Crichtons
Original Air Date: 07/14/2000 on Sci-Fi Channel
Plot Outline:
Moya arrives at a planet where the population test their genetic compatibility by kissing. Cricton kisses a princess, who is next in line for the throne, and discovers that his DNA is a perfect match for her. He must now marry her and they will rule together. This is again the wishes of her brother's, second in line for the throne, and is conspirering with a Scarran.