The intersection of 'civilization' and 'wildness' is what makes Tarzan/Jane stories so fertile. It's less about the literal mechanics of survival—though those can be fun—and more about the power dynamics and mutual adaptation. Jane isn't just a damsel; her curiosity and scientific mind are her survival tools. In fics, you'll often see her teaching him language and social nuance, while he reveals a world beyond her Victorian frameworks.
Romance blooms in that space of translation. The tension isn't just 'will they kiss?', but 'can they ever truly understand each other’s worlds?' A good fic might linger on Jane's internal conflict—the thrill of freedom versus the duty to return. The jungle becomes a metaphor for the untamed self. Survival romance, then, is about two people creating a third, entirely new way of existing, away from all rules.
I've read some that flip the script entirely, where Jane chooses to stay and loses none of her intellect, becoming the chronicler of their life. Others explore the inevitable tragedy if they tried to fit into her world. The best ones make the romance feel earned, built on shared respect for each other's strengths, not just primal attraction.