I don't understand what you mean? A friend with benefit arrangement is a type of romantic interaction, if you take "romance" to be a more child friendly word than "sex" and to lump it together with "love". It's like how we use the word, "love" in English but "love" covers different types of feelings in other languages like agape, eros, philia, pragma, storge, mania etc in Greek.
I think the issue with your suggestion is that if you remove flirt and kiss from romance then you would have to put it in some other category. No doubt this would mean that it would be less friendly towards younger players and would need to a higher age rating.
I think it would be better if you consider that most people over the majority of human history have considered kissing and flirting to be inherently romantic.