If you're married and your spouse isn't into riding, you may have one of two different experiences: either she (or he, in some cases, but more often it's the wife who isn't in to motorcycles) doesn't like you going off on long rides every weekend and drinking with your biker buddies, or she wants to see what riding is all about. You might even make a biker out of her if she loves it.
But where is she going to ride? You might not want to spend the money to get her a bike of her own if she's not going to really love it. To start with, you might let her ride behind you. This can be a problem, though, if your bike isn't really built for two. There are two-seater bikes, but they tend to be the cruisers and other bigger bikes, and some riders don't really like that style. There's also the option of a sidecar, but again, this can be expensive, and it does change how your bike looks and even how it handles.
It's also important to make sure your spouse knows how to safely be a passenger. How he or she sits and shifts their weight will impact how you drive. You will also want to make sure they have a helmet and are wearing proper riding gear. If you're going on a long trip together, you also want to make sure to explain that they may get stiff muscles from sitting in the same position for a longer period than they may be used to.
Riding together can be a lot of fun, but it will be a bit of an adjustment if you're used to riding alone. If it turns out your spouse loves motorcycles, though, it can become a great way of spending time together.