Choosing sepia is all to do with trying to make the image look romantic and idealistic. It's sort of a soft version of propaganda.

I think one of the downsides of the sort of obsession with romantic love and personal fulfillment is that the plain fact of the matter is that those feelings don't last for ever and so they better be replaced and reinforced by things that do.

Sepia in particular tends to make everything look a bit romantic and almost sentimental, hence the fact that it remains such a popular choice for wedding photographs.

Romantic Quotes