My girlfriend loves to worship my biceps. Why is that?

Ok, what's up with that? I've had a few girlfriends but this has never happened to me before. She often grabs my arms and suddenly starts to kiss and lick my biceps. I don't know why. I thought it was a joke but she keeps doing it. She really does it on a regular basis and it confuses me. Why does she do this? What's the reason? She doesn't want to tell me but there must be a reason.
My girlfriend loves to worship my biceps. Why is that?
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