Should 5-year-old kids allowed to see cartoon series where there are princesses and prince? Should they be exposed to romantic inclinations that are subtly shown?

i found your query really cute :) in fact, both my kids love watching a bit of such cartoons, and it's absolutely fine. the idea is that it is all about loving someone, so why to shy away from it? in fact, if you treat it as something that needs to be hidden or not talk about it, your kids will get more curious and talk about it when you are not around. explain them what's going on in an age-appropriate way. for them, love is also an integral part of being friends :)