I can only speak for myself, although I believe many people feel this way. I look for a mate who is confident, self-assured. If I feel that the guy is scared, it's a turn off. The mere fact that he would ask if I was happy would be a turn off. This is probably immature of me, I know, because if you are looking for intimacy, you need to divulge your vulnerability too.
I have a big thing about being smothered and someone being scared around me would make me feel like I had to take care of them too much for comfort.
