Husband can’t have sex every day?

My husband and I are TTC our first. At first we would try to have sex daily the couple days leaving up to ovulation, but he wasn’t able to ejaculate if we had sex daily. Now we’ve started to just have sex every other day after my period, and he’s still having a little bit of trouble with that too.. I don’t think it’s a pressure thing, its been like this even before we started TTC. Anyone have any idea why this would’ve the case or anything we can do to help? I’m 24 and he’s 27.

I use OPKs and I do temping as well! We have sex every other day to make sure that all the sperm is staying fresh. That’s what was recommended for us!