Eternal Love: Played straight – with the proviso that being an entire society of natural immortals, they understand exactly how hard it is to make a relationship work over the longest term, and so invest in cultural features designed to help with that, including marrying late, long and intimate engagements, a degree of cohabitation, short-term contract relationships as “trial runs”, etc., etc., before you even think about putting your seal on an indefinite-term relationship, and also includes a good deal of rather pointed cultural commentary on the obligation to work to make it work in the absence of Magic Relationship Fairies, and so forth, afterwards.