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Not every single decision is based on "basic logic," though. People are people, and they have emotions too. This is the part you don't always pick up on.
People don't decide to have biological children with their partner based on neutrally considering evolutionary pressures. They love their spouses, they enjoy the old-fashioned way of getting pregnant, and they want a child that combines aspects of them and their loved one. If that weren't the case, then there wouldn't be the big infertility business that there is. Just because you don't understand their feelings, or don't take feelings into account when making decisions, doesn't make them any less prevalent in the population at large.
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