Male condoms that break in use do so mostly by a "blunt puncture" mechanism.
BACKGROUND
Published condom breakage studies typically report the percentage of failures but rarely provide any evidence on the mechanism of failure.


METHODS
Over a period of 7 years, broken condoms returned to a supplier (SSL, Durex) via consumer complaints were examined to determine the cause of failure. Also, some consumers who reported breakage but did not return condoms were sent a questionnaire on the causes of breakage. Finally, theories proposed for the mechanism of breakage were investigated on a laboratory coital model.


RESULTS
Nearly 1000 (n=972) returned condoms made from natural rubber and polyurethane were examined. Visible features on those that were broken, were classified. Evidence combined from examining returns, questionnaire responses and the coital model strongly suggests a single predominant mechanism of failure we named "blunt puncture," where the tip of the thrusting male penis progressively stretches one part of the intact condom wall until it ultimately breaks.


CONCLUSIONS
Blunt puncture appears to be the mechanism of breakage responsible for more than 90% of condom breakage not attributable to misuse. Knowledge of the main mechanism of breakage should help develop better user instructions, better test methods and, ultimately, better condoms.
White
Nicholas D
ND
SSL International, Cambridge Technical Centre, 205 Cambridge Science Park, Cambridge, UK. nick.white@ssl-international.com
Hill
David M
DM
Bodemeier
Steffen
S
D017280:Condoms; D004868:Equipment Failure; D006801:Humans; D008297:Male; D011140:Polyurethanes; D012408:Rubber
D011140:Polyurethanes; D012408:Rubber