If you are going to fuck someone:

Use your own provided birth control,

Keep your condom in sight at all times, and put it on yourself,

If it breaks, get the fuck out of her ASAP, and don't go any further,

When finished, dispose of your condom down the toilet and flush it.

If she tells you that she has her own BC and you don't need the condom use it anyway.

If she tries to get you to take the condom off while you are having sex, stop and GTFO.

Condoms are not 100% effective, use spermicide gel as well or better still get a vasectomy.