Same sex marriage

[genkaus]

The whole point of this is that exceptions to a rule invalidate that rule, right?

Yes, the whole point of those exceptions is pointing out the need for better rules. Unfortunately, not everyone has the mental capacity to see that.

So if some people can have XY chromosomes and be female, you cannot say that XY chromosomes indicate male? So how can we define male and female?

Which is why biological entities have more than one defining characteristic.

Apparently, even people in Vedic India understood the concept better than you do, since they classified humans in three genders - male, female and indeterminate.