Circumcision is the removal of the foreskin, either partially or completely. For newborns, it may be done for religious requirements or personal preferences surrounding hygiene and aesthetics.  : 257 Circumcision may also be performed on children or adults to treat phimosis, balanitis, or to prevent transmission of sexually transmitted disease.  : 166 As of 2012 no successful technique to reconstruct a circumcised foreskin had been published.  : 181 Some men have used weights to stretch the skin of the penis to regrow a foreskin; the resulting tissue does cover the glans but does not replicate the features of a foreskin.