As a young male growing up on a farm in Colorado, interaction with members of the opposite sex were limited. Luckily, I had a few cousins to keep me company.
It was one of the greatest years in US history. So much amazing stuff was going on from moon shots to civil rights finally getting past the Democrats in Congress. But we didn't care, we were horny lifeguards.
An older man in a sexless marriage finds lust handily nearby and his life is enriched. That gets his asexual wife going again and they have more adventures than in their younger days.