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 gruelling 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.