Why would a guy do this?

We have been sleeping with each other for a while like years! When we were having sex I was on top faced away from him and he sprayed my entire back with his cologne. Why would a guy do this? Then when we where done he said “I sprayed you with my cologne” I said “great now I’m gonna smell like a man all day” laughed about it then now I’m curious as to why a guy would do this?
Why would a guy do this?
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