A male underwear brief has an elastic waistband, material joined to the waistband, contiguously forming a back panel, an upper front panel, and a crotch panel, a first and a second leg opening for a person's legs, edges of the leg openings reinforced with elastic material, and a horizontal fly opening in front, wherein the back panel and the crotch panel are joined to the reinforced edges of the leg openings, the crotch panel proceeding upward in front ending at a first edge attached to the crotch panel and to each of the leg openings, and the front panel is joined to the edges of the leg openings, ending at a second edge attached to each of the edges of the leg openings overlapping the first edge below the first edge, the overlapped material forming a horizontal fly that opens upward into the brief between the first and second edges.