is at hand any is any disadvantage within marry personality of impossible to tell apart blood group?

Especially if you are both O negative, the blood edge will love you and your future kids
NO.. it's awsome.. as long as your not relatives
No.
no there is no disadv surrounded by it .A reason astern it is if ur BG is b+ same is with another creature so there is no problem . but if it is + & - than it as a problem..!
None
Absolutely not