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1. They'll push their straight agenda onto their kids!
Almost every heterosexual couple WILL assume that their child is straight, because they are. Even as babies, they will talk about how "Little Tommy is such a ladies' man!" Or "Tiny Sarah is so pretty, she's going to get ALL the boys!!"
Behaviors such as these could SERIOUSLY HARM their children!!
2. They could rape their sons and daughters!!
If a mother has a son, she could rape him, as she is attracted to males!! Same goes for fathers and their daughters. This just is not safe for the children.
3. They will FORCE their beliefs onto their children
If they're religious, they'll force their children into that region as well! They could force their children into the belief that ONLY boys and girls can get married, and transgender people don't exist!
4. Many heterosexual couples experience domestic violence, which brings danger to the children
The amount of abusive relationships in heterosexual couples IS SO HIGH! This produces a danger to the children, because they could get into the middle of one of these fights and get seriously injured.
5. If they cannot have children, that is their own fault!!!
If the mother is infertile, and the father wants a child, THATS HIS FAULT! He shouldn't have married someone who he knows he cannot have children with, so they should not be able to adopt.
That sounds pretty stupid right?
These problems exist in both kinds of couples, regardless of whether it is male and male, female and female, or female and male.
Many homosexual couples are perfectly capable people who would make wonderful parents, just like straight couples. And some are terrible parents, but that is the same for heterosexual parents. They are the same.
It depends on the people, not on their sexualities.