mating bite

noun2

1. •
   A bite performed during copulation in certain species.

   • Differences in courtship behavior among higher taxa include use of the spurs by male pythons and boas, mating bites by some colubrids, […] — 1997
2. •
   In speculative erotica, a bite given by one person to another to form a permanent bond, typically leaving a scar or mark.

   • “When the mating bites are exchanged, the two souls link. Then the werewolf can live as long as his vampire mate.” — 2017