Is he into it?

So I've realized that while having sex with my boyfriend I like my hair pulled and getting spanked. I would like to do more just havent said anything. Well last night he put his hands around my neck. Not hard, but just enough, And I actually liked it! In the past I've told him when to pull my I'm wondering if he put his hand around my neck because he thought I would like it, or if maybe it's something he's into as well? I'm just curious as to what you guys think, but I'll probably ask him tonight.

Thanks :)