Plasma membrane progesterone (P4) receptor coupled to G proteins. Seems to act through a G(i) mediated pathway (By similarity). May be involved in oocyte maturation (PubMed:12601167). Also binds dehydroepiandrosterone (DHEA), pregnanolone, pregnenolone and allopregnanolone (By similarity). Colocalizes with a lysosomal protein CTSD/cathepsin D. Expressed in brain and testis. Non-classical progesterone receptors involved in extranuclear signaling are classified in 2 groups: the class II progestin and adipoQ receptor (PAQR) family (also called mPRs) (PAQR5, PAQR6, PAQR7, PAQR8 and PAQR9) and the b5-like heme/steroid-binding protein family (also called MAPRs) (PGRMC1, PGRMC2, NENF and CYB5D2). Belongs to the ADIPOR family.