They do it all the time.
It's a known fundamentalist trend. I'm surprised you don't see more if it. I see it everywhere.
He and his wife Lori, like other Christian couples around the country, share one e-mail account as a safeguard against the ever-expanding temptations of the Internet.
"It's what we believe as Christians: We are our brothers' keepers. It's about biblical accountability."
It's impossible to know how widespread the practice has become. Still, the phenomenon has become common enough to merit a post on "Stuff Christians Like," a popular blog in which creator Jonathan Acuff, an evangelical and son of a pastor, good-naturedly mocks Christian culture and himself.
Acuff shares one account with his wife of eight years, Jenny, and estimates that one-third of their married friends also use one e-mail address.
http://www.foxnews.com/story/2009/09/05/christian-couples-staying-faithful-on-facebook-twitter.html
At the most basic level, this is simply a question of remaining above reproach. It's a way of staying accountable to one another and to the rest of the world. The apostle Paul urges Christians to steer clear not only of evil itself but even of the mere appearance of evil (I Thessalonians 5:22). This is something believers need to take seriously, both in their marriages and in their interactions with others.
We should add that sharing passwords or, if appropriate, maintaining a shared account can also be a way of building a hedge around your marriage. It's a strategy for protecting your relationship against outside threats. Whether you've been married for thirty days or thirty years, you're never really immune to the threat of an extra-marital affair.
http://www.focusonthefamily.com/fam...-passwords-best-practices-for-married-couples
[A]ccording to the Pew Research Center’s latest survey, several new symbols of romantic devotion have taken hold among couples: the shared password, the joint email address and the fused social media profile.
Along with having The Talk and meeting parents, creating joint accounts and passing passwords have apparently become relationship benchmarks. Moving inboxes together is the new moving in together.
Among partners who’ve been together fewer than ten years, 8 percent share a social networking account, while 14 percent of couples together over ten years have a shared profile.
A similar pattern holds true for email, Pew found. Ten percent of couples who’ve been together five years or fewer use the same email account, a figure that jumps to 24 percent for couples together six to 10 years, and climbs to 38 percent for couples who’ve been together over a decade.
“Psychologically, when couples share social media accounts, it more likely than not is a sign of codependency or insecurity,” Suzana Flores, the therapist, told Mashable. “It’s almost like the couple is ... too enmeshed.”
https://www.huffingtonpost.com/2014/02/11/sharing-facebook-profile_n_4768508.html
There's a new trend in social media, and it's not a fresh platform or a new app. Apparently, more and more couples are sharing social media accounts.
A recent study from Social Psychological and Personality Science cited in Mashable shows that this is very much a thing—and furthermore, that couples who post more about their relationships on Facebook say they feel happier and more secure with their partners.
https://www.today.com/health/would-you-share-facebook-twitter-instagram-your-partner-I543575
And besides Focus on the Family, a couple other Christian sites advocating it:
Pro's:
It holds me accountable to what I post and reply to.
I think about my husband, all. of. the. time.
I get to see the things that interest him by the things that he "likes".
It shows that we are one and rids us of any temptations that might come our way from the internet.
I got rid of a lot of "facebook friends".
http://www.agodlymarriageinanungodlyworld.com/2013/10/the-truth-about-combined-facebook.html
Why My Husband and I Share a Facebook Account
https://intentionalbygrace.com/why-my-husband-and-i-share-a-facebook-account/