“How hard do you suck to give a lovebite? And do you roll your tounge over their neck while your doing it?”
If they continue eating their dinner and make a gruff comment about the politician talking on the television, you’re not sucking hard enough. Rolling your tongue over them will probably not help in this case.
If their head falls off, you’re sucking too hard.
Rolling your tongue over them once they’re dead is generally considered gauche.
You’d have to suck majorly to consider giving someone a lovebite. I had one once and I had to tell my mother I accidentally hit my neck on a shelf.