Maintains the normal guidance and termination of axonal branches of VC motorneurons (PubMed:14551437). By associating with cell adhesion protein casy-1, mediates axonal interactions to establish synaptic connections between the male-specific sensory neuron HOA and the AVG interneuron (PubMed:28901288). Plays a role in regulating male mating behavior (PubMed:28901288). Interacts with casy-1; the interaction establishes synaptic connections between neurons. Expressed in head and tail neurons, the ventral nerve cord, the VulF vulval cell and in the somatic gonad (PubMed:14551437). Expressed in the male-specific sensory neuron HOA (PubMed:28901288). Expressed from embryogenesis to adulthood. Belongs to the neurexin family.