Developing code is like having an orgasm.

They are primarily mental processes that require focus and concentration on specific things. Any distraction, no matter how small, will derail the entire process.

Once interrupted, the person cannot just pick up from that point, they have to start over from the beginning and redo all that work.

I've found this analogy pretty solid, even though it sounds silly. You certainly don't need to explain to anyone about interrupted orgasm, or what it takes to get back on track.

(Of course, for orgasm, that re-work is pretty enjoyable, unless you are a professional who gets paid to produce orgasms for other people who demand them of you. Therefore all coders are whores. ;)