What gift is too intimate for close male friend?

Hello everyone, i would like to ask a question and opinion from all of you.

first of all, i'm a female, want to give a close male friend a gift for his birthday, he's like a big brother for me and already married, we're also a colleague at work. what i have in mind is i want to give him a watch, but is it too intimate? if it is, what kind of gift that also not suitable to be given? and if there's a specific reason why please also share since i want to know too

thanks in advance

What gift is too intimate for close male friend?
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