STUD 100 Desensitizing Spray for Men works at once and is easy to apply. Clinical Trials have proven that STUD 100 is quick-acting, safe and effective. It is self-administered. STUD 100 is non-toxic, odorless and ozone friendly. It delays ejaculation by reducing the sensitivity of the penis. Stud 100 has been helping millions of couples achieve better, longer-lasting sex for over 30 years. Generations of lovers can't be wrong! The active ingredient, Lidocaine, is a local anaesthetic which is used to reduce the sensitivity to touch of the penis just before intercourse. The reduction in sensitivity quickly helps to delay ejaculation in cases of over-rapid or premature ejaculation Stud 100 works! And works fast to delay ejaculation.