These sources cover penile traction, vacuum devices, size benchmarks and clinical guidance used in this quiz. Many studies are small. Several are about Peyronie’s disease, not cosmetic enhancement. Quiz projections are examples, not promises or medical advice.
EAU guideline: penile size abnormalities and dysmorphophobia
European Association of Urology, Sexual and Reproductive Health Guidelines (current online edition).Supports: The guideline considers penile traction therapy a conservative option for increasing penile length.
Limitations: The EAU rates the recommendation as weak and describes the supporting evidence as poor, heterogeneous, and based on small cohorts. It does not endorse Epic Extender or any specific commercial device.
EAU guideline: penile curvature
European Association of Urology, Sexual and Reproductive Health Guidelines (current online edition).Supports: The guideline discusses traction and vacuum devices for reducing deformity or as part of multimodal therapy.
Limitations: This evidence mainly concerns men with Peyronie's disease and the recommendation is weak because outcome data are limited.
Penile augmentation and cosmetic surgery: recommendations from the Fifth ICSM
Chung E, Jenkins L, Moon DG, et al. Sexual Medicine Reviews. 2026;14(1):qeaf067. doi:10.1093/sxmrev/qeaf067.Supports: The consensus states that traction can be offered for penile lengthening and cites an average gain around 2 cm after at least 3 months of daily traction.
Limitations: The paper emphasizes modest gains, variable protocols, limited long-term data, and uncertainty about whether one device is superior to another.
Pilot prospective study of a penile extender for short penis
Gontero P, Di Marco M, Giubilei G, et al. BJU International. 2009;103:793–797. doi:10.1111/j.1464-410X.2008.08083.x.Supports: Mean increases of 2.3 cm flaccid and 1.7 cm stretched length after 6 months among study completers.
Limitations: Small, single-arm study; only 15 men completed treatment, daily use was lengthy, and girth did not change significantly.
Penile extender in men with shortened penis
Nikoobakht M, Shahnazari A, Rezaeidanesh M, et al. Journal of Sexual Medicine. 2011;8:3188–3192. doi:10.1111/j.1743-6109.2009.01662.x.Supports: In a 23-person prospective cohort, mean flaccid and stretched length increased after 3 months of high-duration daily use.
Limitations: Small, uncontrolled preliminary study with an intensive wear schedule; it does not establish results for other devices or shorter protocols.
Controlled multicenter traction study in stable Peyronie's disease
Moncada I, Krishnappa P, Romero J, et al. BJU International. 2019;123:694–702. doi:10.1111/bju.14602.Supports: Mean stretched length increased 1.8 cm after 12 weeks in the traction group.
Limitations: Participants had stable Peyronie's disease, used a specific device for 3–8 hours/day, and mild adverse effects were reported in 43%.
Randomized controlled traction trial in Peyronie's disease
Ziegelmann MJ, Savage J, Toussi A, et al. Journal of Urology. 2019;202:599–610. doi:10.1097/JU.0000000000000245.Supports: The treatment group improved penile length by 1.5 cm versus no change in controls after 3 months.
Limitations: The trial studied men with Peyronie's disease using one specific device; it is not evidence that every traction product produces the same outcome.
Systematic review of interventions in normal men concerned about size
Marra G, Drury A, Tran L, et al. Sexual Medicine Reviews. 2020;8:158–180. doi:10.1016/j.sxmr.2019.01.004.Supports: Across low-quality studies, extenders increased flaccid length by less than 2 cm; counseling was often helpful.
Limitations: The review concludes that evidence for enhancement in anatomically normal men is scant and low quality.
Systematic review and nomograms for penile dimensions
Veale D, Miles S, Bramley S, Muir G, Hodsoll J. BJU International. 2015;115:978–986. doi:10.1111/bju.13010.Supports: Clinician-measured pooled averages and nomograms for flaccid, stretched, and erect length and circumference.
Limitations: Erect measurements were available for fewer participants than flaccid measurements, and measurement methods varied between studies.
Review of traction and vacuum device indications
Sultana A, Grice P, Vukina J, Pearce I, Modgil V. Nature Reviews Urology. 2022;19:84–100. doi:10.1038/s41585-021-00532-7.Supports: Reviews clinical uses of traction and vacuum devices across Peyronie's disease, post-prostatectomy rehabilitation, and other settings.
Limitations: Evidence varies substantially by condition, device, and protocol; research into cosmetic use is limited.
