Is 1 or 2 safer?

This just came to mind, is wear a condom safer than 2? Think about this, a condom is 97% safe so based on probability theory,

P(1st condom safe and 2nd condom safe) = P(1st condom safe) * P(2nd condom safe)
= 0.97 * 0.97
= 0.9409
= 94.09%

So guys u know what to do.