Hi sobebicouple,
I don't know of a website or app that has an option for dating as a couple. There are some apps/sites that I know of, but I'm not familiar enough with them to know if they have that option. Adult Friend Finder maybe? Tinder? I don't know.
If Feeld is your only option, you might consider biting the bullet and getting the Facebook account. I'm just saying ...
I hope you find what you're looking for.
Sincerely,
Kevin T.