That makes no sense. Why cannot one support the right of gays to marry, or of women to decide for themselves whether to reproduce, or of citizens to smoke legal weed in the privacy of their homes, and not also favor lower taxes and less government? Indeed, the idea of less intrusive government is quite consistent with not wanting the government to stick its nose in folks' bedrooms and private lives.
Look, marriage was the provenance of the Church, a sacrament. Sorry, but that "same sex union" stuff just doesn't gibe with the teachings of some churches, especially the Bible and Christianity. Heck even Islam doesn't tolerate homosexuality. WOmen deciding whether to reproduce has been standard through civilized times, but deciding to kill the baby after they have engaged in conjugal conduct is another story. We have been over that repeatedly, but murder is murder, the time to choose was before having sex. There are plenty of ways to prevent pregnancy, including not having sex. That's the time to choose, when no innocent need be killed.
Or would you do away with laws against murder?
Governments are instituted among humanity for the purpose of securing their rights, those unalienable rights endowed by their Creator, of Life and Liberty among others, but especially Life, without which all others are moot..
Is that the less intrusive government you want mucking about in everyone's gun cabinet?