He said love marks?

Okay so I'm a very submissive female when it comes to sex and my boyfriend loves dominating me during sex. We have bomb ass sex (;

Anyways one of our favorite position is doggy or anything that has to do it back positions. After finishing he told me " I probably left you some marks or scratches on your back " I said hmm I don't want scratches or marks on my body he then said they are love marks.

So what does he mean by that and is he being selfish by leaving me those marks I mean he loves my body but why would he leave me marks.
He said love marks?
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