Knowing it is very important because it prevent a lot of things from happening, I no that some persons can be ignorance to what it might caused them but is very important to avoid wrong mixture because a lot of issues people are having today is marrying someone that is not compatible with them, if you are AX and still marry someone who also have the same genotype it becomes a serious problem.
No matter how much you love that person whether man or woman don't be blinded by love to continue the relationship because you are not going to have the problem but the children you will be bringing to the world.