There is no possible way, short of severe mental retardation that you would not notice that your husband isn't packin' heat in the shorts for 17 years.
It would mean that for all that time she NEVER saw him/her naked in any sort of light. I personally have never tried to have sex in a room with absolutely no light at all (meaning there was always a smidge of light from somewhere) but even in the darkest rooms, I've always been able to make out body shape.
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