Biting makes kissing more interesting, I'll stand by that point. And I'm not an american't. There needs to be a tiny of bit of pain, or pressure, or conflict to keep a relationship fresh imo. If you're making out it should be 90% dancing tongues, 10% aggression. That's my personal formula that I think keeps it fresh. Translates pretty well to sex too I think. 90% cooperative, 10% conflict. This can apply to BDSM play too because that always (should) be cooperative between both people's limits. Maybe it's better to phrase it as 100% cooperative but ALSO 10% adversarial. Any more than that and it's getting into hate fucking but any less and its just not as engaging.