What aspect of your wife's role(s) in your life are you absolutely sure you could not do without? Please sort out the following in order of importance to you. For argument sake we will imagine it is impossible to get any one else to fill any of the other roles.

1.House keeper: keeping the house clean and organized (includes sorting your socks and making sure you have clean underwear)

2. Cooking

3. Sex Partner

4. Mother for your kids

5. Confidant/adviser/helpmeet: includes any other form of assistance e.g. extra paycheck, joining you in your business etc.

In order of importance

5
4
3
2
1

you need the info for your psychological research or something?

Cooking.

5
4
1
3
2

All of the above in no particular order.