I've done it. It isn't a major turn-on for me. I "earned my red wings" (cunnilingus when she's on her period,) when I was a teen-ager, because it was a thing that was talked about in locker-room talk and one of the litmus tests young males make up which draw arbitrary lines between men and supposed 'real men.' Haven't done that since, though.
Re: intercourse when she's on her period: The mess I can handle, although it can be a pain. I don't really like the change in viscosity as much, when I'm inside her (the blood makes everything thicker, but slightly less viscous, and I just like the feeling of it less.) The biggest annoyance, for me, though, is that if I don't get all of the menstrual blood off of my dick (especially up right behind the glans and down in my pubic hair, that shit burns after it dries. For some reason, it tends to be awfully caustic on the skin of my dick. First couple of times, that put me out of action for a couple days or so.
So, yeah. I'll do it, if she insists, but these days if I do it I'm wearing a condom. Else, I've eight fingers and two thumbs, and I know how to use them very well. I get no complaints.