Hi!  I'm new to this forum but saw this thread and wanted to add my bit.  I completely agree with crashresidue on this one!  I'm a 36yr old, married, am licensed and consistantly carry a Para Companion .45cal.  I LOVE it and shoot every other weekend just to keep the chops up.  I was never interested in guns before-was dragged to the gun shop, went shooting with hubby and hated it, etc.  Until I was involved in a road rage incident and a close call with a drunk, I had never thought seriously about any kind of protection.  When I was ready, NOT MY JUST MY HUBBY, my husband and I decided to start with a gun that we both liked, try that, then buy one I could carry.  We started with the Astra A-100 in .45cal.  Soon, we started shooting with others to "try their guns" and I ended up with "my baby."  
My suggestion in your case is to talk to your wife and find out how SHE feels about a gun in the house.  You might want to do what we did and take some kind of introductory course for CHL to get used to the idea.  Take it from a woman who's been there-you'll never be able to convince your wife to take the gun seriously until she's ready.  If not into guns, she may be interested in some other form of self-defense. Eventually, she may warm up to the idea, but if you force the issue, she'll just keep the gun in a drawer and end up being a victim someday instead.