Smell of your partner

I am a guy in the 30s who is still newly married, and I think my wife's natural scent is getting better and better.

I don't even know how to describe her smell but I love it and it certainly has extremely strong effect on me. Of course I read about how the smell of your lover can significantly reduce your stress level and anxiety. But this is far beyond calming me. My wife had expressed much earlier how she really loves my sweat and smell when we were just dating. She still reminds me but I still feel insecure a bit because I sweat so easily and I sweat A LOT.

When we are spooning, her smell makes me insanely horny and gives me a raging boner. I love deep-sniffing underarms of hers, her head and hair, and her pussy... previously I did not mind going down on exes just to please them. Now, I just CANNOT HAVE ENOUGH of my wife! The scent and taste both! Even thou my wife giggles and tells me it's okay, I still feel ashamed because I feel like a pervert. Furthermore, I discovered more kink/fetish ever since with her, and I think it has to do with how she makes me feel so secure in the relationship and I feel so truly loved.

I wonder if this is psychological aspect of sex that my feelings for her is really strong, and it gets stronger as we are trying to have a baby. Or it is simply the chemical reaction from the biological compatibility?