NES Gel-1, To Evaluate Nestorone Gel in Combination With Testosterone Gel

Inclusion Criteria: * Healthy men * Aged 18-50 years * With normal clinical chemistry, serum levels of testosterone, PSA, gonadotropins within normal limits, and sperm concentration greater than 20 million/mL * Subject or his partner willing to use a recognized effective method of contraception Exclusion Criteria: * Men not living in area of clinics * Clinically significant abnormal findings at screening * Elevated PSA greater than 4 * Partners who are pregnant * Abnormal laboratory values, liver or kidney dysfunction * Sperm counts below 20 million/mL. * Use of androgens or body building substances within 6 months of enrollment, * Blood pressure greater than 140/90, history of hypertension, including hypertension controlled with treatment * History of primary testicular disease or disorder of the hypothalamic-pituitary axis * Hypersensitivity of progestins * History of venous thromboembolism * Benign or malignant liver tumors * Active liver disease, history of reproductive dysfunction including vasectomy or infertility * History of active or chronic cardiac, renal, hepatic or prostatic disease * Diabetes mellitus or morbid obesity (body weight greater than 120% of ideal body weight) * Known or suspected alcoholism or drug abuse * Known dermatitis or severe skin disorder Men desiring fertility within 6 months or participating in competitive sports where drug screening for prohibited substances (including anabolic steroids) is routine will be advised of the relative and temporary hazards that participating in this study may have for their fertility or sporting status.