The “XX” isn’t missing another “X” – never intended to refer that.t
There is this sad story that I came across. Only if that man knew who contributed the other X.
A woman in Bihar’s Purnia district has filed a complaint against her husband who slapped a fine of Rs 25000 on her for delivering a baby girl.
For those who are biology scared (like me) – gather some courage to glance through this Wiki – X Chromosome.