Doggy style slippage tips?!

Paris.
Okay so my boyfriend and i tried doggy style for the first time and it was the greatest thing ever! The only problem was, once we started to really get going he would slip out, also we broke 2 out of 3 condoms 😅 (no biggie though I've got the implant) 
Anyway, he had me bent over the bed and hit it while we were both standing, he's quite a bit taller than me so that's probably part of the issue. Anyone know how to avoid the slippage? It was always at the most inconvinient time/verge of orgasm 😭
We still enjoyed it thoroughly but it was just annoying to constantly have to stop and put him back in, I guess it might be a practise makes perfect thing as it was only our first time doing doggy, but any suggestions or whatever would be appreciated!