As most of you should know, I am a very devout Christian. Throughout my 7 years of marriage, I can not believe what my wife has done.

Normally, I would allow my wife to keep her privacy to herself when she's in the bathroom. As I was walking by, she seemed to be moaning pretty loudly. I ignored it at first and walked by, but the moaning would not stop.
I finally decided to barge into the bathroom to see what the commotion was all about and there I saw it: My wife holding the showerhead to her crotch and inserting it in and out.

I was devastated by the event. My wife realized that I have been watching her and she quickly hid the showerhead.
I eventually forced her out of the bathroom and gave her some severe punishment.
I tied her down and spanked her for 2 hours straight. I'm wondering what other kinds of punishment is suitable for this despicable action to the Lord.
What would you suggest?