"Yes, it was me. It's between my wife and I. It has no impact on my dedication to my constituency. Any other fuckin' questions?"
I learned at age 12 (looking up "Vagina" in Encarta 95 and then lying about it) that the only worthwhile path is complete acknowledgement of what you did and then accepting the consequences. Lying just wastes time.. it'll come out eventually. Also, I learned in that lesson about the value of "History" functions in browsers and software, and watch it carefully.