Using measures of penile tumescence, the striatum, anterior cingulate, insula, amygdala, occipital cortex, sensorimotor cortex and hypothalamus have been shown to play a role in penile erection [15], [20]. (journals.plos.org)
I wonder why Bob doesn't understand that the research shows that the men who are most hômophobic are the same ones who show the greatest amount of pènile tumescence when watching man - on - man pôrn? (religion.blogs.cnn.com)
They choose women based on the «schwing factor», namely how much tumescence in the groin does her appearance create for the man. (omgchronicles.vickilarson.com)