Not really important. Our DM has sometimes thrown in NPCs that you could form a relationship with, never really goes into detail... It's really just treated as another mechanic to raise the stakes and story telling.

Creates new no win situations, like save the girl or save ur friends.

There are PLENTY of horror stories over on Reddit tho... Where freaky and perverted ass players want to go into those details. Or the DM will go about monster raping the female characters, a player may play a Chaotic Evil character and use it as an excuse to go being an aggressive sexual deviant.

All about what your table is for.