According to William Masters and Virginia Johnson’s sexual-response cycle, what would a male experience during the excitement phase?

The penis becomes more erect and may release a few drops of fluid.

Contractions of muscles in and around the penis trigger the release of semen.

The penis becomes erect, the testes pull up, and the skin of the scrotum tightens.

Blood in the genitals recedes and heart rate, blood pressure, and breathing slow to normal rates.