I found that the best method of avoiding the morning after rash after shaving downstairs is using a sugar scrub.

I heard the report about using a stick deoderant, mainly to prevent ingrowing hairs, so tried it for a few weeks, it seemed to help but I still had the red rash.

Then I saw Martha Stewart, bless her insider trading socks, who gave out a recipe for a Sugar scrub. Basically some good sugar (Sugar in the Raw), grapseed oil, a bit of glycerin and then some smelly oil of your choice for flavour... Use it after shaving, ideally in the shower with warm water, rub it on the shaven area and anywhere else you fancy as you're effectively exfoliating that area, then rince off.
Only dab yourself dry afterwards as the grapeseed oil and glycerin leave a slighty oily residue which given a little time is absorbed, leaving you baby butt smooth.
Due to the exfoliation and the moisturising effects of the scrub you should (and I was) waking up with no horrifc rashes.

Dont forget that after a few days or more itching will start just from the grow back.