Male underwear provided with an elastic belt, such as underpants, boxers, boxer-shorts, shorts, thongs, long-johns, G-strings or swimming trunks not provided with an opening, characterised in comprising an additional piece forming a grip tab, arranged on the front upper and central part of the underwear made up of a free lower piece and fixed by the upper part thereof to the underwear by being fixed to the elastic of the belt of said underwear, which permits an easy opening of said underwear by manually gripping and pulling downwards said element through the open fly of a pair of trousers worn outside said underwear.