Let it be said that I have incredibly sensitive skin.
I once decided to start cleaning my privates daily, but with bar soap. Bar soap dries out my northern European-descended skin ridiculously, causing a feeling of tightness all over and immense itching. Well, I didn't quite put that together when I made the above decision. After a week or so of daily showering, itching set it. Soon after that, very tiny paper cut-like things started to appear. Let that sink it. Paper cuts. On your manhood. All over.
Every time I changed, moved, or got a boner, "AGH, OH FUCK, OH GOD."
They stayed for a week or so, and I was constantly aware of them.
Agony.