Mike,
Let me start this by saying that I was in your exact same boat a few years ago. In the Army, living in Texas and enjoying my freedoms. I decided to marry a girl from Braintree and she pooped out a kid. Well, when my contract was up we decided to move to Mass so she could finish out her Bachelor's degree and because I had no other better plan. I didn't own guns at this point, the thought never occurred to me. .Gov was paying me to shoot theirs, why would I want to pay for my own?
Well, my Dad decided as a leaving the Army gift, I was to receive a H&K SP-89. The wife had a mental ****ing melt-down. Lost it, crying, I was a different person, there's no way she's allowing it in the house near the kid, etc. You'd have though I went out and picked up a hooker with ebola and brought it back home to be a nanny. Well, I decided to hold off on taking ownership of the H&K - since you know - it's all small and scary looking. I got a Savage 30-06 instead. Showed her that without the bolt it was just a metal stick. I made her hold it, look at it, realize that without any ammunition in it or the bolt it was nothing but a paperweight. Next came a Glock 23. Same thing - took it apart and handed it to her piece by piece. Here's the frame, and here's the slide. What do you have in your hands? Some plastic and a metal tube. Then I locked them in the safe, told her to try to get them out. Without the code, she was unsuccessful. To be honest, after giving her the code she still couldn't figure it out lol.
So then I had her shoot my Sig. Well, now I had created a monster. Basically, in about a 6 month time-span, my wife went from psycho liberal ****-wad to me having to pry the Glock out of her hands when I decided to trade it off. Now we have two kids, and she has her own AR. They're all locked in the safe (not the kids, unfortunately) and all is well.
Most gun fears come from ignorance. The thought that a gun, by itself is somehow dangerous to those around it unless a highly skilled and trained gun-wrangler is in direct control of it - all stems from people just not knowing any better. If she's willing to give it a chance, and you're willing to take the time to teach her, then you'll be just fine.
If you still think that storing your guns outside of the house and you don't want to take the time to teach your wife then you probably shouldn't own them.