sex with an ex is mens' favourite.Nine out of ten males in Scotland have revisited past sexual encounters in their dreams compared to just over half of women.The second most popular dream for men is when a sex session goes embarrassingly wrong - 76% of males have had this dream.Meanwhile, women fantasise in their sleep about people they know, with erotic dreams about friends and colleagues taking the top spots.In third place for men was an erotic dream about an orgy, experienced by 72% of men.