Why do women use so many different products in the shower, and men use the "all in one" so to speak?

Many men I know have one item that they use in the shower. At the very least, I like shampoo and a separate conditioner. I usually have a shower full of products. Why is their such a difference among the genders?

Why do women use so many different products in the shower, and men use the "all in one" so to speak?
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