Well,Tyo, I was just a little guy about 6 yo, but my parents shared the same bed, so did my Granddad and grandma, my aunt and uncles, neighbors all did too. Was it financial, rent, utilities, food etc... maybe. Was it just the "custom", the way things are, have always been, and will always be...maybe. Was it sexual...I guess, everyone I knew had at least 3 or 4 kids, "and one in the oven!" Could not relate what was being said with what was being... Did I say I was kinda a dumb kid...I guess. But I can remember that a bit later I noticed that Ward and June(? long time ago) Cleaver of "Leave it to Beaver" fame had separate beds. As did Dezi and Lucy and "The Brady Bunch" and..did I say it was a long time ago. But those were family TV programs, and FAMILY was BIG on TV, and morality was too much in style. So I think that was all show, no tell. You know, like it or not our parents, their parents and their parents, parents etc, etc on down the line must of, or HAD to have sex or we wouldn't be here. As I was saying, separate beds? Not to my knowledge. The only purpose would have been to "turn the sexual tensions to way above the fever pitch". No separate beds.
Life experiences, nothing to brag about.