Hi, you said you were looking for a guy's opinion in the men's room...
Firstly, despite what other people say, if you're checking up on him, you don't trust him (maybe justifiably, maybe not). I think I have a couple of DW's passwords from when she's asked me to check her hotmail in the past but I'd simply never check her mail or Facebook account unless she asked me to. Why would I want to unless I didn't trust her?
Secondly, both of us are on Facebook. One of her ex's from ages ago got in touch with her recently and they've been swapping mails. They might get round to meeting up though he's moving out the area soon so maybe not. If she wants to, that's absolutely fine with me. I'd go with her if she wanted me to but to be quite honest, am really not bothered, not least cos it'd mean sorting out a babysitter.
Thirdly, it's the 21st century. I'd really expect people to have male and female friends, including obviously from their past lives. I was out last night with a girl from university who I used to live with (in a house-mate way) til late. DW is off out tonight with a group of mates, single/married, male/female she used to work with.
Personally I can't see why anyone would ever be bothered about partners hanging out with people of the opposite sex or who would want to check their partner's mail/phone etc. unless they fundamentally didn't trust them. Am I wrong here?