Read this article and for happiness, it apparently does not matter if you are having enough/more than enough sex, just whether you are more sex than you believe that your friends are having.
Not sure if that is entirely correct. I personally don't care what others are doing when it pertains to their sexual life, but then again, studies like the one here would not come to fruition unless someone out there did.
I personally wouldn't imagine anyone in the lifestyle to be effected by the amount of sex their friends are having. That's just my opinion.