Pleasure and Pain

I was chewing on a piece of minty gum while I went on a one mile walk today. When I got in I was thirsty so I threw my gum away and got a drink of cold water. The contact of the mint cool left on my tongue with the water caused that strange slightly painful feeling that I love when those two things meet in my mouth. It remains on my tongue for several minutes after the initial feeling, not as much painful as it is soothing. Every time I have this experience it reminds me that sometimes a little pain is necessary to experience pleasure.