By mixing its scent with yours, the cat reassures itself. You are a stable reference point. You smell familiar. You mean safety. This is especially true for cats that are sensitive or deeply bonded to their owners.
The meaning of the head press

Sometimes rubbing turns into something even more intimate. Your cat presses its forehead gently against you. This is often called a headbutt, but it is neither aggressive nor accidental. It is one of the strongest trust signals a cat can offer.
This gesture involves areas rich in scent glands and is reserved for close relationships. When your cat does this, it is fully including you in its emotional territory. Not all cats do it. When they do, it is significant.
How to respond
The best response is calm and respectful. Gentle strokes on the cheeks or behind the ears mirror the cat’s intent. There is no need to overwhelm it with attention. If the cat moves away after rubbing, let it go. The message has been delivered.
Understanding and respecting these small signals strengthens the bond. Cats value consent and subtlety, even in affection.