Does the erection stay? In a forum discussion on the topic, users illustrate many random moments where a situation could arise, during a communal movie or in the midst of a volleyball game. Two things cause a man to get an erection when viewing a nude woman. Previous generations admired the penis and its connection to masculinity. They like the shapes they see. For some, the fear of getting a Women naked men erect in public erection is enough to curb their interest in it.