Dolly Parton has revealed the key to her 56-year marriage with husband Carl Thomas Dean is their shared warped sense of humor. The country legend believes that humor is crucial in a long-lasting marriage. Parton also mentioned that they have never had any serious arguments and that they have different interests and work in different fields, which allows them to have their own space. Despite rarely being seen in public together, Parton and Dean have kept their romance alive by keeping things fresh and dressing up for each other.