In uncircumcised men, material that collects between the preputium(skin duplicature) and the head of the penis is called smegma. Smegma normally has an unpleasant odor due to bacterial activity. Infection in this localized area (balano-postitis) can also cause an unpleasant smell. You can perform a deep cleaning to your husband’s penis using warm water and soap. You can also test for the prescence of bacteria and request that you both be examined for a yeast infection. A yeast infection can be passed between you two ad infinitum.