Far to the north amidst the endless ice-flows it is rumored that a dwarven Walrus Totem clan exists. These rumors have been unsubstantiated to date, unless the dwarven sage Glurt Goblinguts is to be believed. He claims to once having encountered a troupe of huge dwarves, each standing a beard’s length higher than the tallest known dwarf. These dwarven “giants”, their hairy chins crusted with frozen shards of ice and dirt, hauled gargantuan yellowed horns or tusks upon their wide shoulders, and their helms, likewise, sported massive, down-ward pointing tusk-horns. Glurt Goblinguts later speculated that the impressive size of these dwarves was most likely due to their arctic diets, almost exclusively fat-based.
In the province of Behar in India, there is a bizarre custom that persists to the present day. Young men are kidnapped at knife (gun) point, and forced into marriage. If they refuse or cause trouble upon meeting their blushing bride-to-be, they are told that their family members will come to harm or even be killed if they resist. Some manage to fall in love or accept their fate. This scenario can be adapted to any rpg, ideally with a pc in the role of the abducted future husband!
"Binding the Life Coil" is an ancient quasi-mystical technique rediscovered to prolong one's life at the expense of one reproductive ability. It is a simple magikal technique that anyone can learn (a skill or feat). The promise of near immortality or a lifespan of a thousand years or more makes everyone want to learn it.
This technique has a price though, the amount of immortality is in direct response to the strength of ones reproductive spirit. Those that have never breed will live longer than those that have. The use of the technique makes conception difficult, if not impossible. So you trade the future of your society for the chance for you to see much of that future.