Why does my friends with benefits ask me if I've slept with anyone else?

islandsister
So I've been sleeping with this guy for a while. We are not exclusive, we only hear from each other when we want sex. But I've noticed that each time we get together, he has to ask if I've slept with one anyone else and he says it's out of curiosity. Recently we hooked up again and he asked again and I told him that I had slept with someone else which then led to him asking if he had a bigger package and if he was better than him in bed?
Why does my friends with benefits ask me if I've slept with anyone else?
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