Long deployments / remote spousing also leave room for other arrangements. As long as the checks come in, why not remain married in name only?
"Staying married in name only" means anyone under the UCMJ can't have sex _ever_ if its a marriage in name only.
Yeah. Totally a reason to stay married in name only.
It started out voluntary enough but the lack of a sex life led to that sort of problem.
ETA: It's also illegal even if you are single but sleep with somebody who's married (whether the married person is military or not).
Given they'll be gone a long time and the increased chances they'll come back missing parts or a Different Person (like Frodo after that little Ring adventure).
I'm in the It's-Not-For-Everybody category.