It Wasn't Her First Time Being Used Like That...

I've been married to Sarah for almost five years now. We have a good life together; we have kids and the house and everything you'd call normal. But there's this thing she does that I can never figure out why she started doing it, or how long before me she was doing it with other guys... Sarah had always been the more adventurous one in bed when we first met, but over time... well, let's just say it wasn't what you'd call exciting anymore. So, last summer, I found a little note from her on my pillow. It said that she wanted to spice things up, and mentioned this idea of a secret