Take my solid advice - You need to find a woman who's into open relationships right from the off. This is the only way of achieving genuine long term relationship happiness. Yeah other dudes are going to tell you they've been with their wifes 5,10,20+ years whatever and it's great but they are simply lying to you.
No one is getting off on hitting that same ass month after month, year after year. You can pretend but in the end you'll know you're lying to yourself / wasting your time. Best just face the truth that we as a species just love banging around. If you can find that truth in your woman then you will both have the rides - literally - of your life.