Luckily for me, I stay away from marriage. As a wise man once said, "Why buy a cow when milk is available in the market". 
I wanted kids. And I wanted them brought up in a supportive environment so I wanted a long term partner.
Didn't want to be a crap dad.
Glad I did. The kids have given me so much substance and richness to my life. They're men now.
I had two mistresses during that time.
As soon as kids went to Uni I literally went fucking wild
Must've fucked about 40 odd women over last, almost, four years.
Would've been into the two hundred different girls route if i didn't prefer the regs/ SA girls with long hours, quality with friendly fondness over quantity, kinda thing.
Everyone has different requirements.