Both have jobs. Both have bills. Both own homes. Both drive cars. Both pay taxes. Both have fights. Both buy groceries. Both cook dinners. Both cut grass. Both have deep personal feelings of love and commitment for each other. Both have pets. Both put out garbage. Both shovel snow. Both watch TV. Both read. Both vote. Both may serve in the military. Both have families. Both ......
EVERYTHING homosexuals do heterosexuals do. They just do a few things with a different gender.
What percentage of your overall life would you guesstimate is spent having sex? 5% maybe? Probably less.
So if you subtract the "icky sex with the same gender spouse" - there's absolutely NO difference between a gay marriage and a straight marriage.