Receptor for relaxins. The activity of this receptor is mediated by G proteins leading to stimulation of adenylate cyclase and an increase of cAMP. Binding of the ligand may also activate a tyrosine kinase pathway that inhibits the activity of a phosphodiesterase that degrades cAMP (By similarity). Interacts with C1QTNF8. Detected in brain cortex, and at low levels in testis. Belongs to the G-protein coupled receptor 1 family.