Amazing sex? All the time?! Rant??

I've been reading in magazines things like "how to have amazing sex" or "get the best O with these tricks".  Not only this but sometimes I read in comments on here (glow) how satisfied some people are when having sex with the SO.  Can we be real?? Idk is sex amazing Every. Single. Time.  I read that it's wrong if you don't get an O with your SO every time.  It makes me think negatively.  So really?  Is it OK if we don't achieve our big O?  Does it mean the relationship is doomed to fail?  Does it mean your SO is a selfish asshole?  Idk... Is this just me?  Sex can't be this big of a deal right?