A woman takes a lover home during the day while her husband is at work.
Two engineering students meet on campus one day. The first engineer calls out to the other, "Hey nice bike! Where did you get it?"
A girl asks her boyfriend to come over Friday night and have dinner with her parents. Since this is such a big event, the girl tells him that after dinner, she would like to have sex with him for the first time.
This concerns a question in a physics degree exam at the University of Copenhagen: "Describe how to determine the height of a skyscraper with a barometer."