Passion is almost oposite to the love of old couples. Passion is very strong but it fades soon. Love is much more mild but it can last forever. The sex in Marriage has much more to do with passion in the beginning but after that something must replace passion. Most say there’s no marriage without sex but how do they do after decades together? I’m with my wife for five years now. As the relation is still kinda new it didn’t happen yet but surely someday passion will fade away and from what i read in magazines everybody is still having sex after passion fades. Is it a lie? What do they do to not become more like brothers and sisters to their  wives and husbands? Or do they become brothers and sisters and eventually sex is not an option anymore? If this is the case why does everybody lies about this? Are we obligated to have sex to be happy and functional and accepted? How long does sexual interest remains in a relationship? What i can say for my five years is that sex is not the most important thing anymore. The person i’m with is much more than that. Only to be able to participate in her life would be enough. I can’t think of myself anymore without her. So what’s the role of sex in this relation? What is the trick?