I wish that there was a setting in the relationship panel that you could set them as boyfriend or girlfriend or fiancée when you're creating a family. Especially I want them living together but there ...
I think having little pet names between sims would be fun too; like Little Love-Monkey for someone in a romantic relationship or Little Turtle for a toddler son/daughter. The names should also be made by the simmer like when a baby is born. Squishy-Face!