I was just having a little fun at your expense, but the fact that many people find themselves in this type of situation and it's not just limited to guitars/music. There is an interesting discussion that touches on this a bit over at Christian Guitar Resources (
Ponderings on G.A.S.). The thing is that even a modestly priced quality guitar is going to cost at least a couple hundred dollars and while it's more cost-effective than buying a higher-end guitar costing in excess of $1,000, it does represent a significant cash outlay that solely benefits you. You could make the argument that said purchase would also benefit her as it would result in a happier husband......but that almost never works
. But as with any major purchase, communication and planning are very very very important - the only real chance for success.
Of course, you could get your love making skills on and ask her in the heat of the moment; then the next day when you come back from Guitar Center with a nice expensive guitar you just say "well, honey, you did say yes....three times in fact"
.