Is it normal for guys to be so obsessed with giving oral sex?

I have been dating this guy for 3 months but have known him for +6 months. A couple times a week he tells me he wants my vagina so bad or he wants to suck on me so bad. What is the obsession and is this a good thing? I've never dated someone that so badly always wants to be down there. He tells me he misses me too quite a bit, so I know its hopefully not all about that :).
Is it normal for guys to be so obsessed with giving oral sex?
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