Transcription factor which binds the DNA motif 5'-[CGA][TCA][TA]ACAATGT[AT][TGA]C-3', probably as a monomer (PubMed:9490411). Acts partially redundantly with the transcription factor dmd-3 to coordinate tail tip cell fusion and retraction and thereby regulate male tail tip morphogenesis (PubMed:18550714, PubMed:21408209). Promotes male-specific development of two tissues, the peripheral nervous system and the intestine (PubMed:9490411). In the peripheral nervous system, directs differentiation of sensory ray neuroblasts into peripheral sense organs (PubMed:9490411). In the intestine, causes repression of vitellogenin gene transcription (PubMed:9490411). Expression is undetectable in hermaphrodites, but persists in males (PubMed:9490411). In males, expressed in cells of the tail tip (PubMed:18550714). Expressed in late larvae of both sexes. In the fourth larval stage, expression is approximately six-fold higher in males than in hermaphrodites. Expressed in ADF chemosensory neurons in males from the L4 larval stage (PubMed:31264582). Expressed in cells of the male tail tip from the L4 larval stage (PubMed:18550714). Not expressed in cells of the hermaphrodite tail tip at any developmental stage (PubMed:18550714). Negatively regulated by lin-41 which causes degradation of the mRNA encoding this protein.