Ａ：早洩（Premature Ejaculation, PE）令愈來愈多男性受困擾，亦有年輕化趨勢。世界衞生組織定義早洩為「無法延遲射精以充分享受性愛，其表現為射精發生於性交進行前或剛開始性交時」（The inability to delay ejaculation sufficiently to enjoy lovemaking, which is manifested by either an occurrence of ejaculation before or very soon after the beginning of intercourse）。
