Here is an amusing blog post about what you wouldn't (or would) allow your children to see you doing.
"It was as I was hiding a fully lit cigarette in my mouth last night, as Dora asked me a very complicated question about Doctor Who, that I thought: what else wouldn't I let my kids see me doing?"
Somehow I think my list is a little different from hers. Especially when it comes to the "not minding your children seeing you [cough] with your husband" part. Never mind what that would do to my husband; it's also not something I ever want them to have a mental picture of. Think about it - do you want to have that picture of your parents stuck in your head for the rest of your life? I doubt it.
What else would I add to my list? I like having them see me work - it's good for them to see that I like it and hate it all in one day. That way they'll have the right expectations when they're grown up. I don't want them to see me blow up at others - howl at the driver who cuts us off, be rude to a completely clueless waitress - that sort of thing. While I wouldn't mind them seeing me drink (if I was drinking these days), I wouldn't let them see me drunk. As an adult you always think that sort of thing is so funny at the time, but it's usually either scary or embarrassing for the child.
Anything else you can think of?