do you get attached?

So based on stereotypes and whatever, girls are supposed to get "attached" to the guys they sleep with, right? At least your first one I guess. But I've never been this way. I've slept with 4 different guys and have felt next to nothing for any of them, despite having known them before and continuing to see them afterward. I usually actually totally forget it even happened when I see them - I am completely unaffected. All of them, however have ended up confessing feelings for me and I still feel nothing. So what I'm wondering is if any of you are the same way? Or am I just suuuper f***ing weird??