title: Monitoring sexual activity--methods for measuring natural coitus.
mesh_terms: D002021:Buffers; D003075:Coitus; D005260:Female; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008722:Methods; D009948:Orgasm; D011312:Pressure; D012725:Sexual Behavior; D013081:Sperm Motility; D013094:Spermatozoa; D013686:Telemetry; D013739:Testosterone / Q000097:blood; D013997:Time Factors; D014599:Uterus; D014621:Vagina / Q000502:physiology
chemical_list: D002021:Buffers; D013739:Testosterone