In the last hour of work today, I was revising a scene in the middle of my novel. (Slow day. We have those occasionally.) This scene was, um, a little steamy. When you write a scene like that, you've got to picture exactly what's going on - as in the logistics of it - or you'll have people being contortionists with too many hands.
Not that there's anything wrong with that.
I think, from now on, I'll try to save the revision of those types of scenes for home-based revision. Although I suppose I could always claim I was having a hormonal shift caused by The Change. "And that's why I was fanning myself like I'd just run a marathon. Really."