It would all depend on how heavy your periods are of course! It sounds a repulsive thng to do, but some females are at their peak at this time of the month!
Well, of course you can! It helps immensely if you're open-minded, have a sense of humor about bodily functions and are not easily squicked out by messes, but there's absolutely no reason not to. I heartily agree with the towel suggestion, but wearing a condom only for that reason is just silly and unnecessary.
It is a bit gross especially if ur on ur heaviest day, but I think it's actually better! All that mess adds to it! (Did I REALLY just say that?!) And you can have the fun of a shower straight after together! I wouldn't recommend oral though (again, did I REALLY just say that!!)
no reason not too, and I do feel quite horny at that time. Also, if you have a light flow, or are on one of your non-heavy days, your man can do some clitoral oral, just best to have a wash first perhaps and avoid delving too deep!!
If you usually use condoms then you still need to use them if you have sex during a period, because a) you can still catch and pass on sexually transmitted diseases and b) i believe there's still a small chance you could get pregnant even if you are on a period.