He cums too fast - Advice?

Okay so, I have been talking to someone new and I really like him, everything is going great. But he fairly warned me that he doesn't last long. So in my mind I'm thinking 5 minutes? And he said he could at least go rounds. We have sex and it's more like 1 minute or less. A literal two pump & done. and I've been veey understanding about it, last time we went 3 rounds (since it ended quick that was within 15min) and each time he came fast. Is there any way to fix that? lol. besides consistent sex IF that even works. we didn't use condoms, so we might try that & see if it makes a difference.

Any advise??