Can men and women be just good friends?

They were virtually unheard of for most of human history, but today, in many cultures, friendships between men and women are common place. Still, that niggling doubt never seems to go away - is the relationship really entirely platonic?

Read our Research Digest to find out.

Having had a marriage with a male partner and offspring surely only if people get engaged to be married can the relationship be of a sexual nature.