I am highly susceptible to yeast infections and just general irritation in that area. I have found that fragrance of any kind is a huge irritant. I now use fragrance free Dove soap, fragrance free men's Edge Shaving Gel, fragrance free tampons, Northern toilet paper b/c it has no fragrance, Purex Clear detergent and fragrance free dryer sheets. Basically I keep any and all fragrance away from that area. It's sad that my clean clothes don't smell like sunshine anymore but I sure feel better!!
As an aside I am not allergic to anything and have no skin/fragrance problems anywhere else.
Hope that helps!!