Girls and Guys is this quote true about marriage and relationships?

100% true.
i think that sexual compatibility is of just as much importance as emotional and intellectual compatibility.
when the sex is good, you don't pay much attention to it, you have it regularly, and spend more time focusing on other areas of your relationship that need work. but when it's bad, either you aren't having enough, or it's lost it's excitement, then it's on your mind quite a bit, and causes stress in the other areas of your relationship.

I think what this is trying to say is that when someone is attracted to their partner, it's really hard for the sex to be bad. I have a friend who has never had an orgasm in her life. She just can't. And yet she talks about sex more than anyone in our circle of friends, and she and her boy screw like rabbits. I just didn't get it for a while, and one day I asked her why she was so fascinated when she got absolutely nothing out of it, and she said that she didn't really need the physical pleasure at all, because all of her enjoyment came from being so attracted and in love with her boyfriend and making him happy. So even orgasm-less sex isn't bad sex for people if they are left feeling fulfilled. Another one of my friends can have orgasms, said that since he started falling out of love with his girl, the sex just isn't the same, and at some points, he'd just rather not do it.
So I'm thinking that the reason why bad sex accounts for 90% of a relationship is because there's no attraction left. And what relationship can run without attraction? When the sex is good and only accounts for 10%, I'm thinking it just means that they're getting their other 90% somewhere else haha.

It's found all over the internet, and people who have sex on their mind when it comes to relationships are promiscuous. A good relationship doesn't exactly have to have good sex.