What Hubby Doesn't Know Can't Hurt Him, Right?

What I thought was an innocent affair, turned disastrous in more ways than one. Tom and I have a great relationship. We have been together since high school. Our kids are growing up and we have a lot more freedom now. This should be so much fun for both of us. But for some reason, even though we are very close and connected in most ways, we are not really excelling in the sex department.