STUD 100® Male Genital Desensitizer is a must-have item in your Sexual Health treasure chest. On the market since 1970, it is specially formulated to help in cases of premature or over-rapid ejaculation. STUD 100® contains Lidocaine USP 9.6% w/w (approx. 10mg per spray) and meets all requirements outlined by the FDA?s Monograph on Male Genital Desensitizers. For nearly 50 years, STUD 100® has been helping couples to prolong the moment.