If he's that into it, then yeah, then it's almost like he's marking his territory. Most people don't do leave hickies on purpose. But yeah, he thinks its fun and funny and does like marking you like you're his.
It feels good to receive a hickie especially in the heat of the moment. My bf just have me one last night but I feel the same way like he's trying to mark his territory. And I just got hired at my new job now I have to try to cover it up so I don't look bad cuz I work with customer service. But honestly maybe he has some kind of issues with his ex my bf was cheated on by his ex and she put a restraining order on him and went completely ballistic on him by telling the cops that he tried to lite her on fire and a bunch of crazy lies...then stalked him for two weeks until the court date and then dropped the restraining order so maybe it's just trust issue thing to make sure other guys back off so something like cheating doesn't happen again