Yes, a B+ girl and a B+ boy can marry each other without any medical concerns related to their blood groups. Blood group compatibility is not a factor that affects the ability to get married or have a healthy relationship.
Blood groups are classified based on the presence or absence of specific antigens on the surface of red blood cells. The ABO blood group system includes blood types A, B, AB, and O, and the Rh factor (positive or negative) is another important factor.
When two individuals with B+ blood group marry, they both have the B antigen and Rh factor positive on their red blood cells. There is no inherent biological issue or risk related to blood group compatibility when both partners have the same blood group. Their blood types are compatible, and they can lead a healthy and happy life together.
It's essential to remember that blood group compatibility is only one small aspect of overall health, and many other factors contribute to a successful and happy marriage, such as communication, mutual respect, shared values, and emotional compatibility.