I read that Guardian article a few years back too and it definitely resonated with me - as does your post and the PP who said the less they did it, the less they felt like it.
With 4 DC and zero family support, as well as some pretty trying situations over the last few years including international moves, job moves, school moves etc tbh we were at a point where we maybe had sex once a month. It was never that I didn’t fancy DH - I just had other priorities (like rest!) and my head has to be in the right space for sex - I find it really hard to just make myself in the mood if my head is full of the kids’ crap day at school, or the impending upheaval of a new job, or simply that I miss my friends from home and am lonely etc etc etc. DH on the other hand can switch it on immediately. For him - it’s often a way to de-stress, for me - I’d rather cuddle and fall asleep.
We went for a minimum of once a week, but aiming for twice a week. That felt way more realistic than daily, and saying it was once or twice in a 7 day period meant there was less pressure. It could be Sat & Sun if we were having a lazy weekend, or Mon & Fri if the week got away from us. We aimed for twice a week but once was mandatory if you like.
It worked for us - I would say we managed twice a week maybe 70% of the time, and once a week the rest of the time. It’s not a lot by a lot of people’s standards but it was way better than once a month!
It definitely helped to bring us closer together and I think we would have continued had DH not gotten sick last year. Due to his cancer treatment we went more than 7months with nothing at all and we are slowly just finding our feet again with being intimate over these last few months as we process the trauma of the last year. I feel like we are now at a stage to really kickstart things again properly and I think we need to probably do something more scheduled again - we’re in a very different place to where we were a few years ago, and we are incredibly close in other physical ways, but I do miss the fun of sex and I need something to force me out of my head sometimes