From personal experience, I would say, yes, yes they are. Those who don't appear emotional or sensitive are just hiding under their crab shell. I dated a cancer once and he appeared very logic-driven, and was very sarcastic and a bit of a jerk, but it was all just to protect his own vulnerability.
One of my cancer friend's entire movie collection solely consists of kids' movies and classic "chick flick" titles such as "The Notebook". He's a straight 20 yr old guy.