Sexual "compatibility" is no guarantee for anything. Since we are so free to look around who is compatible with us, there are much less succesful marriages. Of course there are sexless mariages, but you can't say that they are all because they didn't knew they are "incompatible". I think this is a lie of our society today, that you need to look for someone that "fits" you the best. It is not the relationship which gets better of sex, but the sex life gets better in a good relationship. Compatibility is essential in a relationship, but you can't degrade it only to sex life. You need to enjoy your partners personality, not only her/his body. The body will get boring after a while, if you don't belong together as persons, the relationship has no chance. This is also one point why it is important to not get sexualy engaged before mariage, to get the SO much better known. After having sex, you see an idealized version of your bf/gf. It's a braintrick, to stay with him/her, which is very important in mariage, but is very bad if you sleep with someone who will not be a good partner for you, because you may come to this realization simply too late... So I'm still convinced that it is much better to invest in knowing the other persons soul before mariage than her/his body. PS. I've read the reports on those two links, but I can't say that they would have had a better marriage if they've slept with their bf before.