Guys have reported getting girlfriends pregnant during cycles of test, so it is not a hard and fast rule. I would definately still use some sort of birth control - I use marriage.
Exogenous test can be used as birth control but the amount administered has to be fairly specific. Clinics use just enough to level out your monthly rise and fall in test without completely shutting down your testes/hpta.
Assume for safety's sake that you are potent and fertile while on cycle. You'd really have to cycle irresponsibly for a long time to completely sterilize yourself.
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