Actually that’s a trick post title, there aren’t any common warning signs, there’s only one.
The sex starts to go away.
That’s it. That’s all you have to go on. You can fairly safely ignore all the words coming out of her mouth about the state of the relationship and simply focus on whether or not the sex is crappy/gone, or hot/frequent.
Marriage is always a sexual relationship. It can be a good sexual relationship, or a bad sexual relationship, but it’s always a sexual relationship. So if the sex is bad, your relationship is bad.
Unless you can point to clear reasons as to why sex isn’t happening, like she’s totally exhausted with breastfeeding a newborn, or her exam finals are stressing her out like crazy, or her parents are staying over and the walls are paper-thin, then you have a relationship problem happening. Note in all those things I suggested, they can all resolve and sex can bounce back. The newborn can get bigger. The exams are over. Her parents go back home. The sex comes back.
But if there is no bouncing back and your sex life is just crappy… you’re in a bad relationship.
Any time someone says *everything* is going great about their relationship, except the sex, it’s a crock of shit. The relationship is a sexual relationship and the sex is bad so it’s a bad sexual relationship. Plus if you’re in a bad sexual relationship, so is your wife, so the clock may be ticking on a lot worse than simply you having to jerk off in the shower.
If this is all news to you and you want a good sexual relationship, you gotta buy the MMSL Primer and get the whole story.