One hundred sixteen male viscose rayon workers exposed to carbon disulfide and 79 other workers, who were not exposed to any toxic agent in the working environment, were asked about their sexual behavior and reproductive record. Forty-three exposed and 35 nonexposed men provided a semen sample. The relationship with occupational exposure was analyzed with univariate and multivariate methods. The results indicate a significant effect of carbon disulfide exposure on libido and potency, but no effects were noted on fertility nor on semen quality.