This paper is one of the few studies that touch upon the sensitive semantic domain about sex with a documentation approach. Our findings provide preliminary insights on how sex-related taboos and euphemism are used in the Hong Kong Deaf community and the role of gender in the shaping of the linguistic variation, though study of a larger scale is still needed to reach a more firmed conclusion. Furthermore, this paper proposes criteria to deal with variant forms that are composed of more than two lexical signs or classifiers, which is a first attempt in the study of linguistic variation. The observations in this paper, though preliminary and limited, do offer new directions for possible future researches. At the same time, the variation documented and analyzed will be extremely useful in preparing sex-education materials for the Deaf community and sign language interpretation training programmes.