Children... Sasuke wanted the Uchiha compound be filled with his children. He has a beautiful wife with beautiful long midnight tresses; she is kind and most of all she is the Hyuuga heiress. No, he does not love her, nor does he believe she loves him. It was just a fateful encounter when she was tipsy after Naruto's wedding with Sakura. It just happened.
No. She was not pregnant. He just took her chastity and took responsibility. More so, she was the most fitting to carry his children.
It's been three long years since their wedding. They tried many a times but failed each time. It seems that there's always something missing.
Was it love? But for a woman to get pregnant, love has nothing to do with it.
Was it because he does not desire her? He would have not bedded her that night if he didn't.
Did they lack compassion? Sasuke did it every time given a chance; he's very compassionate with it.
Was it because this is not a marriage of choice for them? No, that can't be.
There must only be one reason.
ONE OF THEM IS INFERTILE.
Well... I just edited a little