Visiting a Cameroon tribe claiming to have the world's happiest marriages, PJ undergoes a ritual possession, and Tim builds a love shack and gets sick.

Indonesia's Sasak people show Tim how to fight like a love warrior; PJ publicly praises his machismo, but she privately rolls her eyes.

In a Papua New Guinea village, Tim and PJ undergo fertility rituals, which include sacrificing a pig and locating an egg that could reveal their future.

The couple trek through Mongolia with nomadic herders; worn down by the grueling climate, PJ wonders if her engagement to Tim is a mistake.

Jealousy flares when PJ teams with a handsome member of Nigeria's polygamous Wodaabe tribe, prompting Tim to face hard truths about himself.

In China, a negative horoscope reading drives Tim and PJ to prove their commitment; PJ must deal with her painful past and learn to cry.