Would you let your SO finish inside you if you’re on BC?

Would you let your SO finish inside you without a condom if you’re in birth control and not trying to conceive? I’ve always heard it feels even better for guys to do that but I don’t know if it’s too risky to let him even if you’re on good birth control. I know one of my friends let’s her boyfriend do it all the time and she’s on really good birth control and has never gotten pregnant from it. What do you think? What form of BC is best for this sort of thing? Could it hurt if I let him do it just once maybe right before my period starts or something?