Good views here. I remember way back in high school, I was one of those sensitive guys. I had a GF though, and she always told me that I shouldn't be so sappy. It's funny because I actually didn't think we were right for each other, so I was trying to get out of the relationship, so I became more sappy, in hopes that she would get turned off and stop liking me. By the way, on a side note, if you're ever going to break up with a girl, the only way to do it for good is to get to the point where she doesn't ever want to see you again, there is no "let's try to be friends" possibility, at least not any that would actually work that way.
Anyways, this girl continued to hold on despite me trying to become more and more sensitive and sappy, and all sorts of stuff that I'd hate admitting to. Needless to say, it didn't work, and she stayed with me. Crazy. I ended up having to just come out and cut her off, but she kept coming back to me for months after trying to get me to take her back.
I think this shows that if you are sensitive and in a relationship with a girl, she may not just dump you because you're like that. It's not that big a deal unless you're trying to get girls and you're all sappy, then it may work against you. A little sensitivity is good though, but when you are sensitive, be sincere and don't be more sensitive than the girl. That's the type that will turn a girl off.