> You wanted a baby, you are there when your partner gives birth, you are both happy. What difference does it make where the DNA came from?

Thinking about raising a baby from some other father activates my disgust reaction. But maybe it’s more related to the idea of the woman’s (hidden?) infidelity than the baby itself.

> There are plenty of folks who have to rely on sperm donors or surrogate mothers to make a baby happen.

I don’t see other people’s difficulties as relevant to my preferences.

For example, homeless people eating from trash cans doesn’t affect my dietary choices.

Your intuitions about family and human relations are deeply abnormal and you should be aware of that for the future when you talk to people.