Stud 100The world's leading delay spray for men, STUD 100 has been specially formulated to help delay ejaculation and improve sexual relationships. sensitivity of the penis. It contains 9.6% Lidocaine, a widely used topical anesthetic. STUD 100 is non-toxic, odorless, and ozone friendly, and can be used with branded latex condoms. No prescription required. STUD 100 conforms to all FDA regulations and is approved by leading health authorities around the world.