G-protein coupled receptor (Probable). Plays a role in the navigational capacity of sperm and promotes the targeting of sperm derived from males to the fertilization site in the uterus of hermaphrodites (PubMed:28662030). Expressed throughout the head. Abnormal distribution of male-derived sperm in the hermaphrodite uterus following mating, with sperm accumulating at the spermathecal-uterine valve 1 hour following mating. Belongs to the nematode receptor-like protein srb family.