Heheh, NOT washing your car will probably do more damage to your paint
I didn't wash my car for two weeks, and sure enough, I had hit a nasty bug. Little booger messed up the paint where his guts had been. So now I have 2-3 spoils in my paint (sorta looks like the paint melted for a few seconds, then hardened right back up... Not sure how to describe it. It's like dented and twisted at the same time).
Oh well. The town I live in, it's pointless to repair the paint for now. (I've had the car maybe 5-6 months, and I have 10+ small chips in the front, and I don't even bother counting the back (right behind the tires)).
When I move, I think I'll just get a body kit and repair any other chips.
But anyway, back on topic - it won't hurt your car to wash it. It will hurt it NOT to wash it