I sure wouldn't recommend it, especially if you are both working in different styles and mediums. You destroy individual identity. Two names on a website, FB page; two heads in an avatar -- someone always looks like the weaker artist. One artist talks, one artist follows. One is the star, one is in the shadows. One is serious, one is along for the ride. One wants to soar, one is the anchor. One is the artist, one is there to keep an eye on the artist. NONE of that may be true, but that's the perception.
The better solution is to create two strong identities and then cross-pollinate.
What if someone wants out of the relationship? Statistically, someone always does. If you've built your own art identity you simply cut back on the cross-pollination and carry on.
Compromising your account is compromising your art. Don't compromise the last place where you can truly be you.
Dan Turner
Dan Turner's Seven Keys to Selling Art Online