Upon reaching the age of sexual activity, circumcised men develop sexual problems three times as often as do non-circumcised men, due to decreased sensitivity of the penis. Many men complain they have been circumcised without their consent. Some of them even try to restore their foreskin by mechanical or surgical means. Insofar as there are medical benefits, such as a possibly reduced risk of HIV infection, circumcision can be postponed until an age at which such a risk is relevant and the man himself can decide about the intervention or opt for alternatives.