Actually people have "half a child" all the time. Every time a sibling reproduces, for example, that's half a child. So there's a perfectly viable strategy of

Actually people have "half a child" all the time. Every time a sibling reproduces, for example, that's half a child. So there's a perfectly viable strategy of helping your siblings have more children instead of having more children yourself. If you can create more than 2 successful sibling-children for every child you don't have, your inclusive genetic fitness is increased. This doesn't mean your conclusion (people gamble! men gamble more than women!) is wrong, but your line of reasoning is.