A fabric assembly attachable to the front side of a men's underwear and a men's underwear having such a fabric assembly are described. The fabric assembly has layers of fabrics having linear slots perpendicular to each other so that the wearer can take his genital organ out through the intersection of the linear slots. The peripheries of the fabric layers are elastically stitched together to make a fabric assembly. The fabric layers have sufficient rigidity such that the linear slots do not open under the pressure of the genital organ, unless the wearer uses his hands to open the slots. The fabric assembly may also have a flap on the inside or outside of the fabric layers. One or two sides of the flap may be attached to the men's underwear and the other sides may not be attached to permit easy opening of the flap by hand.