I don't think it's a sexist thread. The OP is a guy, looking for some perspective from other guys. Female and gay providers seem to typically run into different issues. Nothing wrong with that. There are a few girls out there that seem to react more like guys to these things, but I'm not one, and I've never dated one, so I can't speak to that. I can only offer a straight girl's perspective, which may not be very helpful.
I do share stories with my significant other, who isn't in health or the fire service, when I have some reason, or just need to talk about it. I try to keep it to the funny and successful stuff, but it doesn't bother him if I need to get something off my chest. He also knows more about a lot of scientific topics than I do, so I often learn something from him.
That being said, he sometimes gets jealous of all the time I spend around hot guys. He also gets some flak from his friends, who expect him to be the macho one in the relationship. So far, he seems to be fine with it, but I could see it causing problems later on.
I really can't talk to my parents and siblings about it at all. They still can't get over the idea that their little baby daughter breaks dead people's ribs...
I wouldn't equate having watched a lot of gory videos to being able to better handle the stories. Maybe boyfriends won't be having nightmares about what I describe, but I'm not sure that voyeuristic enthusiasm over every last little drop of blood is any better. A lot of guys are unable to move past that and consider the emotional aspects of a call at all.