Why would you say that? Again, it appears to be biased against men.

Childbirth and the pain

Nursing, lack of sleep for years

Rearing

Out of the above four, three are done exclusively by women, and demand a lot of effort and some risks.

It can be incredibly rewarding to have a child... but also very costly. The man can just leave. The pregnant woman can't.

Biased against men? Please.

What you are talking about is "sunk cost."

So, in a given relationship, the man or the woman could value the children more.

In a given relationship, the man or the woman could value sex more.

It's not true that all men care less about (i.e., value less) their children, which is what you said, though I don't believe you meant it. That's why I said your statement was biased against men.

I don't see how the generalization "women are more invested in sex" in either your interpretation of that phrase, or mine, would be correct.

What? Nursing doesn't last that long, and 'lack of sleep' is part of rearing and not forced on the woman.

>The man can just leave. The pregnant woman can't.

She can give the child up for adoption just as easily as the man can leave the relationship. And rearing is the vast majority of the effort.

Yes women have to do more, but the difference is not nearly as much as you're arguing.

Is it your argument that women having a stronger attachment to a newborn is a bias against them? Because I was only trying to argue that there was less bias than EGreg said. If she decides she wants the baby then it doesn't seem like a negative to me.

Edit: Oh, I'm a dumbass. I didn't make it clear that the 'giving up the child' was only in response to the pregnancy scenario. That's because once both parents are raising the kid, after a breakup both or either of them would continue raising it.