What does it mean when you lean your forehead against someone else's?

I have been seeing this guy casually and we always have a tendancy to touch foreheads together. Sometimes during sex, sometimes before kissing, and sometimes we'll just be cuddling. This is the first person I've been with who I do this with. I love it and it feels really intense and intimate. I always read about how people say that body language has a lot of meaning so I was just curious as to what touching foreheads meant. Thanks. :)
What does it mean when you lean your forehead against someone else's?
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