Delay sprays do work. Usually delay sprays contain local anesthetics within them. For example, procaine and bupivacaine may work to prolong ejaculation by primarily blocking sensation in the glans and the transmission of sexual stimulation. After using the time-delay spray, you should be careful to wipe it off during sexual intercourse so as not to affect the sensation of sexual intercourse due to paralysis of the female vagina caused by the spray. In addition, some men do not feel the effect when using the time-delay spray. When the time-delay spray does not work, you can choose oral medication to prolong ejaculation under the guidance of your doctor, such as Dapoxetine. Some men may also lead to impotence when using time-delay sprays because the sensation is blocked.