 From the earliest records, the Sumerians had very relaxed attitudes toward sex and their sexual mores were determined not by whether a sexual act was deemed immoral, but rather by whether or not it made a person ritually unclean.The Sumerians widely believed that masturbation enhanced sexual potency, both for men and for women, and they frequently engaged in it, both alone and with their partners.The Sumerians did not regard anal sex as taboo either.