Black. Guys, as a general rule, don't care to do laundry too much. They feel that black won't show the dirt as much. In addition, if the bed set is flowery or quite feminine, then they don't feel very masculine sleeping in it. Keep the bed set a neutral pattern or a darker plain color.
My boyfriend is into jarrah woods and my baby brother likes black and my older brother likes like beige. I wish all guys like red colour furnitures it's so funky and looks great with dark curtins and sheets.