The headline is a lie. I wish I could trust fair.org to be honest, but they are being ... unfair. WaPo gives the male/female liberal/conservative ratios and rightly concludes that the numbers don't match. At no point do they say which sex should compromise. Here's what they say:
As the researchers Lyman Stone and Brad Wilcox have noted, about 1 in 5 young singles will have little choice but to marry someone outside their ideological tribe. The other option is that they decline to get married at all — not an ideal outcome considering the data showing that marriage is good for the health of societies and individuals alike. (This, of course, is on average; marriage isn’t for everyone. Nor is staying in a physically or emotionally abusive marriage ever the right choice. But, on the whole, while politically mixed couples report somewhat lower levels of satisfaction than same-party couples, they are still likely to be happier than those who remain single.)
I'm not saying that the Washington Post should be trusted on all things, or that we should forget that it can act as a billionaire influencer project, but I DO think we should expect fair.org to be more credible than to make up such misleading click-bait headlines.