Good news: You're a man, and i'll bet you can name dozens of machines that have "built-in redundancy", parts that take over if another part fails so the machine will work just as well. That's your spare testis. The only "measure" is what your wife says. Being a great lover involves much more than just your erection & ejaculation; keep asking her what she likes best involving every part of both bodies.
Answered 12/1/2013
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