Frustrated boyfriend

So we have a good sex life. We like to experiment with new things and probably have sex at least 3 to 4 times/ week. The problem is that recently he's been tired and stressed about money so he wants to have sex but can't. I've started taking it easy on asking for sex so he doesn't feel pressured. He also mentioned wanting to try pills or something to help, but most of what we found takes about lasting longer (which he definitely has no problem with). Anyone have suggestions or tips?