Caring about what God thinks about Marriage, is not "trying to control everyone's sex life".
Like I said, I realize you can pull up a list of polygamists. But have you not read, he created them male and female? In the beginning, it was thus. They two were twain, and became one flesh. God very much so cares about polygamy. Just because God suffered them in the past because of how they were, does not mean it's okay for everyone to do. Sort of like how Moses suffered them to write a bill of divorce, only cause of the hardness of their hearts. Pulling up a list of men who divorced women for other reasons is a moot point. Only one man was perfect, and He was also God. And He showed how they were suffered to do some things. However, now we are in the time of Christ. We are Christians, and we are to emulate Jesus. Please show me where God had more than one "wife" - Spiritually speaking. Marriage was made to emulate the divine, and protect the family. For Israels rejection, and continues spiritual adultery, they were given their bill of divorcement. They didn't want Him anymore. Christ gave himself for the church, His bride. Be thou faithful, and not an harlot.
Be careful what you wish for.
Eze 23:4 And the names of them were Aholah the elder, and Aholibah her sister: and they were mine, and they bare sons and daughters. Thus were their names; Samaria is Aholah, and Jerusalem Aholibah.
So I'm curious. Since so many 'Christians' shun you immediately when you breach the topic of polygyny, what would happen if David came and walked our streets? Hosea? Gideon? Would we shun them because they practiced polygyny, some of the greatest men of God?