Did you know Chamois Butter is distributed by a company in Missouri? It's all you can get around here. I suspect it's just udder balm, repackaged so they can charge a couple bucks more--but I haven't compared the ingredients.
When I ran marathons, I used body glide on places where I chafed like bra straps. I wouldn't use it "down there." I've always used chamois butter for longer rides--over 40ish. Tube for the house and small disposable packets for emergency reapplication during long rides.
"Well-behaved women seldom make history." --Laurel Thatcher Ulrich
'09 Trek WSD 2.1 with a Brooks B-68 saddle
'11 Trek WSD Madone 5.2 with Brooks B-17