Getting caught by your kids when your together is very embarasing...but getting caught while your with someone other than your spouse is down right frightening.
I was in our basement with mrs. wiscpl's best friend when our oldest son busted through the door looking for us. Mrs. wiscpl was upstairs and knew what was happening and keeping an eye on the kids. We quickly seperated and acted like nothing was happening, attended to his question (young kids have so many), and asked him to go find mom. Needless to say thats the last time we did that while they were still awake.