While your levels of testosterone are low or your body is still adjusting to testosterone, your ovaries can still produce eggs. Vaginal sex with a fertile male could mean pregnancy.

The only way you can ensure you don’t get pregnant is to have your female reproductive organs completely removed.”

From the Castro-Mission Health Center in San Fran:
“Testosterone should not be used to prevent pregnancy. Even if you have stopped having periods you should still use birth control (practice safe sex!) if you are having sex where your partner’s semen could contact your vagina.”

You wouldn’t want to take birth control pills or an IUD with hormones because it would screw up the effects of your T.

Basically if you still have ovaries then there is a chance that you could get pregnant.

At one of the conferences I attended I met a couple of guys who accidently got pregnant even though they had been on T for a year and were not having periods.

Not disagreeing about the condoms – you need to prevent STI’s, not just pregnancy.

Some guys have gotten pregnant while on T. It might be good to use a condom even after menstruation has stopped or at least until you have not menstruated for a number of months.