Marriage has already expanded well beyond what it may have stereotypically been in the minds of some. People marry five or more times,  include mixed races, and involve age differences of more that 50 years.  People tend to live longer and be healthier when married.

Instead of thinking of marriage as only sexual why not consider marriage as a legal contract between two people for the purpose of support, kinship, love, companionship, respect, and commitment without regard to race, gender, or faith.