How do you know when the masturbator is wearing down?

How do you know when the masturbator is wearing down?

T&A1987 T&A1987
mine haven't been providing as powerful orgasms as they used to and I'm concerned. Are they wearing down (each get about 3 uses a week since Jan) is my penis being desensitized, or is it something else?
04/27/2012
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T&A1987 T&A1987
obviously that should say "know," sorry for the typo.
04/27/2012
Total posts: 2
Unique posters: 1