My ex of 5 yrs use to do that to me all the time, I hated HATED it... maybe it was cause he'd usually do it after he made me feel stupid or after a fight...
I do it to my current boo all tha time, but he has to be in tha mood, last time i did it, he told me that i was irritating his scalp

as far as when in bed with each other, he has this weird thing for hair pulling

He likes when i pull the front of his hair ... for some odd reason...
I like gettin my back caressed

or my stomach or even my thighs ... but my head/hair iunno in a way it makes me feel smaller than i am ... like im some kinda pet or something