Yes. It could be a big deal especially because distance can make one to become vulnerable to sexual temptations.
Personally, I wouldn’t like to stay away from my husband for a long time or live in different countries. But if that’s the best choice at the moment, then maybe I would have to make some sacrifices.
However, the most important things are controlling sexual desires and constant communication, honesty and transparency.
If the husband or the wife has issues controlling their sexual desires, then I think it’s best for the wife to stay back.