I have heard that latex sheath may help premature ejaculation. Is this true?

Today, various types of external latex rigid sheaths are available. Basically these devices are worn over the penis and fastened around the pelvis with a belt. The penis is placed inside a plastic dildo and it is the actual sheath which is placed inside the vagina. The sheath prevents the penis from getting stimulated from the vagina walls and helps regain control of their ejaculation. This technique has not been useful as many women claim that they would rather use a “dildo” instead- and many do behind your back.