Didn't you read the part about preventing infidelity to kismeses they might have as well? The goal is to prevent them from feeling so black that they would do things portraying their black relationship. So they shouldn't be so black for each other that kissing is probably going to happen. It might not necessarily be "oh they cheated on me our relationship will never be the same", but it's definitely not "oh cool bro glad to hear you two swapped spit see you on Sunday". Kissing might take place, but I don't believe the exposition supports any idea that it should be a regular occurrence in an ashen relationship.

Also, it's auspistice, with a second S.