Three years ago my wife and I moved back to the town where she grew up (she'd been in California almost 40 years, we met and married there). Her best friend, who'd been in New York City almost the same exact length of time also moved back to town. My wife and I have been together 31 years. I have never fooled around on her and I believe the same of her. Her friend was married and divorced twice and carried on a star-crossed, doomed affair for some years with a married doctor. That broke up around 20 years ago. Her friend says she has not been with a man since then. My wife has a congenital condition that saps her strength and has affected her health negatively. As such, her sex drive and ability to engage in sex has diminished greatly over the last few years. Her friend is quite active, youthful-looking, has lost 30 pounds in the last few months and wants to lose 30 more. She is getting fit and toned and says she "wants the body I had in my 20s". Who knows, she might even turn to science for a nip/tuck along the way. In any event, this lady is on the prowl or soon will be. My wife is becoming jealous of her friend. Her friend often questions my wife about the frequency and quality of our sexual relations, jokes that she's always horny with a wet pussy and wants to hear about it so she's got something by which to masturbate. She tells my wife that if she's not "keeping him (me) busy", then "send him (me) over". My wife knows she's kidding, but...(BTW, that was from a recent phone conversation my wife related to me). When it's just the three of us the topic often turns to sex. I am not comfortable discussing such under these circumstances. She often talks about masturbating, dildos, and her interest in securing the attentions of a younger man at some unspecified point. Oh, I should let you know that a few months ago her friend said to me while we were discussing something unrelated on the phone, "I'd fuck you." Yes, I heard it right. Yes, I was taken aback. No, I did not react. So, just to cut it short, no, there is no way I would cheat on my wife and especially not with her best friend. However, I don't want to be caught alone with this woman, and I don't need the grief from all the drama. I don't want to feel defensive over the situation. Any insights and suggestions are appreciated.