In the end, "sex is complicated".
Goldstein
Irwin
I
D001143:Arousal; D003075:Coitus; D005260:Female; D006801:Humans; D008297:Male; D012107:Research Design; D012735:Sexual Dysfunction, Physiological / Q000145:classification* / Q000175:diagnosis*; D020018:Sexual Dysfunctions, Psychological / Q000145:classification* / Q000175:diagnosis*; D012747:Sexual Partners