all come into this world as either male or female

What about transgenders ?

no difference in the level of intelligence

Yes that's true . Although male brain is slightly greater than female and ha ms certain areas more developed than female but overall ...

group that should be subordinate to men

That's sick mentality and is not acceptable nowadays .

After marriage, a woman should live with respect to her husband. These are not laws or not mandatory, but they should be. Then it is an ornament for a woman.

Even if these are mandatory , there is no harm in them. They would make life more graceful .

I'll conclude by asking , what according to you should be changed in srilankan society towards women or is there anything discriminatory or somethng you want to change or be more liberal ?

Good luck