https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13965199Edit ImageSaveSaveEditCropCustom TextThe secret companion, a medical work on onanism ... and on venereal and syphilitic diseases ... followed by observations on marriage.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 698 px | 300 dpiLarge JPEG 3500 x 2035 px | 300 dpiBest Quality JPEG 4916 x 2859 px | 300 dpiFree DownloadThe secret companion, a medical work on onanism ... and on venereal and syphilitic diseases ... followed by observations on marriage.More