This ad is used to encourage preventative medicine known back then as a "prophylaxis". Many people mess around with each other without thinking about their health. This affects their lifestyle when they realize that their health is declining. This ad gives those who are sexually active an idea of what could happen. The young, beautiful woman on this ad gives the reader an idea that even though someone may look clean, they may not be. It says, "You may think she's your gal but she may be everyone's pal". This means that whoever you are with may be with people other than you. Therefore, do what's right; get prophylaxis to be on the "safe side".