Huh, interesting. Although as an ace, the sex thing is kind of worrisome - is it really that important to a romantic relationship?
It’d be cool if they had statistics on what made happy open relationships, or polyamorous ones, or non-sexual romantic ones. The not culturally standard ones in general, really.
Sex is important, IMO, not so much in the physical act, but in mutual compatibility.
Imagine a situation where one member of the couple has a high sex drive, while the other has a low one. If a solution to that is not agreed upon early in the relationship, it has a high potential of causing problems later on. This ended up being a deal breaker in an earlier relationship I had prior to my husband.
My bf at the time had a horribly low, nearly non-existant sex drive. I adore being intimate and crave physical affection and being repeatedly denied made me rejected, frustrated, and resentful. On the flip side, he was constantly irritated with how “demanding” I was of physical affection. It was distracting, and why couldn’t I just be content with just being close without all the touching? Eventually, it got to be too much and we split because of it.
This is part of the reason why I feel that pre-marital sex in a relationship is definitely not a bad thing.
I’d also like to point out that they mean sex without procreation being the end point is important. Kids just ruin everything.