Perry definitely reacts best to people who just ignore him for a little while. He will eventually come close, sniff feet, etc. and then might, if you still act very chill, let you reach down and let him sniff your hand and then possibly pet him. It's taken several years (though he only sees them twice a year) for him to actively approach my sisters for attention - this past Christmas visit home was the first time he put his feet up on them (standing on his back legs) when they were sitting at the table - they were shocked
I can think of only one person that he approached/ climbed on AND sniffed her breath! the very first time he met her - that was my aunt (who runs a pet store and owns the place where he gets groomed in the US). He has never given kisses - not even to me - the closest he will come to that is sniffing your breath/ head/ face
It's really sad in a lot of ways - not because he doesn't like people - but because you can see him _wanting_ to get close to people, wanting their attention, but being very unsure of it!