Dating vs friendship
As their star level increases, they will use new dialogue and give gifts to the player at four stars and up.
The higher their friendship level is, the more positive dialogue they will have.
Most of these do not explicitly state the sexual or nonsexual nature of relationships; the fact that homosexuality was taboo in Western European cultures at the time means that some sexual relationships may be hidden, but at the same time the rareness of romantic friendship in modern times means that references to nonsexual relationships may be misinterpreted, as alleged by Faderman, Coontz, Anthony Rotundo, Douglas Bush, and others.
Cats with one and zero stars will have negative dialogue towards the player.
The heart system is not used for non-marriageable cats.
we may remember that such an ideal, often exalted above the love of women, could exist in real life, from Montaigne to Sir Thomas Browne, and was conspicuous in Renaissance literature. The French philosopher Montaigne described the concept of romantic friendship (without using this English term) in his essay "On Friendship." In addition to distinguishing this type of love from homosexuality ("this other Greek licence"), another way in which Montaigne differed from the modern view Seeing (to speake truly) that the ordinary sufficiency of women cannot answer this conference and communication, the nurse of this sacred bond: nor seem their minds strong enough to endure the pulling of a knot so hard, so fast, and durable.
Lesbian-feminist historian Lillian Faderman cites Montaigne, using "On Friendship" as evidence that romantic friendship was distinct from homosexuality, since the former could be extolled by famous and respected writers, who simultaneously disparaged homosexuality.