Research undertaken at Oxford University suggests that an increasing number of people are spying on their partners online.
One in five couples admitted to reading a partner's emails or text messages, and 13 per cent examined their partner's internet browsing history. More than 2,400 individuals were questioned in the research.
Six per cent of the couples had met online, of which over a third had met at an internet dating site and 19 per cent in a chat room.
Online daters choose more diverse partners, according to the research, as 36 per cent of the 'online' couples had different levels of education compared with 21 per cent of 'offline' couples.
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