Harman, I have been reading this thread a while and think it's very sad that there's a fundamental lack of trust between the genders from some posters.
I can see there's a case for that where somebody's been cheated on. I would find that hard to get over, I'm sure. However I do think that the more you try to ringfence your bloke and stop him doing stuff "in case he's tempted", the more likely it is that he'll be tempted - tempted that is, to go and spend time with someone who doesn't suspect him of misbehaviour he may very well not even be considering.
And the irony there is that it confirms the suspicions of the woman who wants to do the suspecting that all men are bastards and not to be trusted.
I don't think you did anything wrong in inviting three other people back to your house after the pub. I do think it's interesting how the more suspicious posters misconstrued the details of that (it was a flat(!), the children were asleep upstairs, etc).
I am also sad that the mistrust is dressed up as having respect for one another in a relationship. Some of you automatically wouldn't do something like this, however innocent, because you think it would be disrespecting your partner. Only if you have a mind in the gutter in the first place, I would hazard - for so many of us, it isn't even worthy of thought, but if you're the sort of twittering "ooh, get her" elbow-nudging, bosom-hefting gossip, I can see that this sort of behaviour would be grist to your mill.
Not addressing anyone in particular, you understand - but if you feel this description suits you, I'm happy to have been of service.