The Ancient Greeks created their dildos from a carved penis covered in leather or animal intestines to create a more natural feel.[10] The Romans created double-ended dildos for use with a partner. Ancient Chinese dildos were made of bronze or other metals and some were hollow allowing them to be filled with liquid to simulate an ejaculation.[11] These were used because wealthy Chinese men would often have too many wives to please. In Persia, it was thought that the blood of the hymen was unclean, and should be avoided by husbands.