When I was at my uncle's house yesterday, his long haired cat finally came out to look at me. He was suspicious at first, but I talked to him and put my hand out.
He walked over to me, sniffed my hand, and after a moment's thought, he put his head under my palm. He did that a few times....always vocalizing....then he finally laid down on his back, but I couldn't reach down to rub his belly. Maybe next time.