You're probably going to get scratched, but try using a face cloth or other rough material, dipped in cold water, and rub his 'bits' much like a mother cat would clean a kitten in order to trigger urination.
Oh, and have a sample tube handy, because he might go off like a fountain.
From:
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Oh, and have a sample tube handy, because he might go off like a fountain.
From:
no subject