Strictly should refer to penis and vagina but usually referring to the entire copulatory complex of penis, vagina, atrium, adenodactyls, bursa, etc.
copulatory_complex_cestopla.jpg
copulatory_complex_cryptoce.jpg
copulatory_complex_leptopla.jpg
copulatory_complex_notoplan.jpg
copulatory_complex_planocer.jpg
copulatory_complex_triclad2.jpg
copulatory_complex_triclads.jpg
internal_structure_polycla2.jpg
internal_structure_polyclad.jpg
internal_structure_triclads.jpg
pharynx_leptoplana_tremella.jpg