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Lingerie can be fun for you...or your partner too. I look at it this way; presents are a little more fun with wrapping paper to unwrap.
I do not think lingerie is a waste of money and I treated myself to it more when I was single actually...
Etsy sells lingerie; which was such a surprise to me. It is nice to use this site to shop from since I can support small-business owners at the same time.