m jab bhi sex krta hu to ling ko yoni me dalne ke thodi der bad hi ling ekdm loosley ho jata h or viry chhad jata hai. bad me badi mushkil se ling ko khda krta hu lekin fir vahi yoni me dalne ke kuch samay bad hi ling shithil ho jata h. m achche se sex nahi kr pa rha hu. please mujhe koi upchar ya medicine batayein