"so, why are heterosexual allowed to marry if they decide not have kids? or if they can't have kids?"
Look at what you have been reduced to. Our folks played cards and their children were in bed together fucking right under their nose.
"You don't have to lie anymore mom, I know it was you that came in my room and had sex with me, you're wearing the red toenail polish. She bent down, giving Bryanna's asscheek a big smooch, and watched my cock plunging in and out of her hole. Sean glanced down at his tight figure, his six pack just beginning to form, a moment of sadness washed over him, he was going to lose that in a few short months with the baby on the way.
He gently put his hand on Sean's bare thigh increasing the feelings in Sean's groin. When the morning light hit Caris, she was the second to be awake.