I am buying an A8. She cannot drive a manual transmission.
We both work and have three separate funds: mine, hers, and "family fund" to which we both contribute a set percentage of our after-tax earnings. This arrangement really works well for us, and we have essentially zero disagreements over financial issues. She does what she wants with her money, and I do what I want with mine.
Of course, 100% of the Corvette will be paid out of my personal fund. So why, then, would I pay for all of it, and then buy something she can drive as well?
Hum... That is a great question. I suppose I am a sucker. Ha! ... In all seriousness, I will enjoy letting her drive it as long as she doesn't damage it.