In general, Men like to be with other Men. Particularly if engaged in some worthy pursuit, like hunting, battle, or some work project (esp. construction). We also tend to get along better with each other than women do with other women, and we keep each other in line (”Don’t be a dick!”). One of my many theories is that we get along bettor because we have to: Needless confrontation can lead to a real fight, and real fights between men can and do lead to death. Getting along is thus a survival skill. Juxtapose this with the female of the species. Just my observations/theories, worth less than two cents.
Marriage is really an artificial construct.In higher order mammals males mate with females and then generally move on.