i do think there is a slight element of hypocrisy here, if I may say...
a lot of you seem to be saying that you wouldn't mind if your DP looked at your emails and texts because you don't use them to talk about intimate things i.e. you only have those types of conversations when you are with your friends in person.
but would you be happy if your DP was standing over your shoulder listening in on these conversations? Or if he was bugging you against your knowledge. Surely that would be an invasion of privacy, no?
so if you wouldn't want your DP to be present at your intimate friend chats, why would it conversely be ok for you to look at his/her emails and texts?
I do realise that a lot of people find out about affairs in this way but I can only imagine that if someone is looking in the first place, it is because they have something to suspect i.e. this behaviour says more about the relationship itself than the act of snooping per se.
I leave my phone on and my pc too, within easy reach of DW but I really would be pissed off if she snooped on them - and I never look at her laptop or her phone, unless I am expressly asked to do so in a specific situation.
The main problem is one of context. Things read very differently from a third party. And if she sees a bit of porn in my internet history, will it tell the full story that I was probably bored while on a long business trip?
I don't think any relationship can be perfect and I feel that snooping is unhealthy because it implies that one or other of you wants to control the entire information flow and know everything. That just doesn't feel healthy to me. As long as everything is good between two partners in their day to day interraction, why go looking for issues?