I've tasted blood a few times, mostly from breaking a tooth and it wasn't nice. On the other hand maybe I just need to taste it some more, like I have with sweat. I'm generally unfit and have quite an active job where I sweat a lot, so over the years I've become very used to catching drips of sweat and I'm not only used to it by now but its also not exactly an unwelcome occurrence anymore to drink a few drips of my sweat. Well, I wouldn't drink it in a glass or anything but it does help out when I'm dehydrated. Maybe if my gums bled every day, just a little bit, I would grow accustomed to the taste of my blood too.