I've never been close with guys IRL (I prolly don't even have one I can consider a friend except for a fudanshi classmate) so 'casual' touches like pats on the shoulder feel very weird to me. I can't even remember if my brother and I ever hugged in our entire lives!...Oh wait, there was that time. But he was in a very emotionally vulnerable place so it probably doesn't count.
On the other hand, I'm quite touchy-feely with a number of females. For example, my high school classmates and I would playfully poke each other in the stomach whenever we met or teased each other. (Thinking about it now, I feel like my pokes were more like jabs? I probably wasn't able to judge my strength plus I was the tallest...oh, dear. ) Since most of them were much shorter than me, I would also often hug them from behind and place my chin on the top of their heads when we're standing by and waiting for something.
My little sister claims to be touch-averse, so she hates it when I try to hug her. (I really miss that cute, smol kid who had to be pacified with cuddles when sulking a storm and would cling to me while sleeping.) That doesn't stop her from doing that girlfriend-hugging-boyfriend's-arm thing to me when we walk together tho.
My mother tho — she LOVES to pinch and stroke the fleshy inner part of my upper arms when she's watching something. That skinship I definitely do not like. There were quite a few times she wanted me to sit next to her and let her do that to her heart's content in exchange for a favor.
But out of them all, my best friend is the one who is not shy with touching at all. We hug a lot especially when meeting and saying goodbye, and we even hold hands when walking. As per her words: "It's not like you're an outsider" (i.e you're practically family) which always makes the dead, empty hole in my chest warm up a bit. Skinship doesn't feel weird at all when you've already shared clothes and showered together with the other person.