After ejaculation, it is essential to withdraw BEFORE your penis goes flaccid again.
Hold the condom in place as you withdraw after ejaculation
HOLD THE CONDOM ON THE SHAFT OF YOUR PENIS WHILE YOU WITHDRAW.
This is because when your previously erect penis returns to its flaccid state, it ‘shrinks’ and if you do not hold the condom in place and withdrawn BEFORE this happens, it’s very likely to slip off and stay inside your partner.
This makes using the condom irrelevant for that particular act of intercourse – and increases the risks of pregnancy and/or infection.