Magnetic Resonance Image (MRI) of a male and female engaged in sexual intercourse, sagittal view. The uterus and vaginal canal are colored brown and the penis and testicles are colored pink. In this frame the penis has come almost completely out of the vagina, soon to reenter upon the following rhythmic male pelvic thrust. The erect penis bends upward, resembling a boomerang in shape. Roughly half of the penis is within the male body, anchored by the bulb of the penis, seen on the right. Upon arousal, the outer third of the vagina canal becomes vasoconstricted, moistening, while the inner two thirds expand slightly and the uterus becomes elevated - all in preparation for receiving sperm.
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