Magnetic resonance imaging of male and female genitals during coitus and female sexual arousal

Willibrord Weijmar Schultz, Pek van Andel, Ida Sabelis, Eduard Mooyaart
Fig 3.

Midsagittal image of the anatomy of sexual intercourse (experiment 12). P=penis, Ur=urethra, Pe=perineum, U=uterus, S=symphysis, B=bladder, I=intestine, L5=lumbar 5, Sc=scrotum