Why does a husband carry his new bride over the threshold?
The custom of a groom carrying his bride over the threshold is a custom that dates back to about 200 AD. The Germanic Goths of the time would primarily marry those in their own communities, but if there were not enough women to go around, the men would raid their neighbors. Since these women were unwilling participants the men would be forced to carry them home.
I suppose in today’s age the women should be carrying the men over the threshold.