God thinks so highly of marriage that He compares Christ and the church to a husband and wife.
Sex was GOD’S idea, not man’s.
It’s a good thing in the context of a marriage relationship and does no dishonor to any wife who has it with her husband.
Yes it was, and Joseph and Mary took it seriously. They had at least 6 children, maybe more.
I don't think they became true Christians until after the death and resurrection of Christ, and we don't even know for sure, if all of them got saved, or if only some of them, but I think Jesus' half brother James, was the leader of the Jerusalem church. If people disagree, that's on them.