For example
You need a new headlight bulb or windscreen wiper for your car. You know you'll struggle to fit it so you'll send your wife to the shop because it's ok for a woman to ask them to fit it.
Or you need a spare part at a DIY.. store but don't know it's real name. Much easier to send her in to ask for one of these thingamajigs that fits on a wotyamacallit.
Superb Opinion