A study by Oxford University has shown that some 20% of married couples read their partner's emails and text messages without their partner's knowledge. 10% spy on their partner's visited sites history, motivated by suspicion of "online infidelity".
6,012 married couples were polled by the university, with 97% saying they disapproved of their partners falling in love with someone online, and 85% said they didn't like their partner flirting online.
Study author Ellen Helsper said: "We found it quite surprising how many couples check up on each other online. However, snooping on each other was not necessarily about... cheating. It could also be to keep an eye on spending."