They can but it doesn't mean that they should or shouldn't. It is up to her to decide. Most women want their tattoo's to be in secret. Showing someone else is a symbol of trust and a level of intimacy. For example, my tattoo is on my left hip. A sign that only a few people will ever see it because I am shy and enjoy some mystery in life. However, I have been debating getting a line of japanize symbols for strength, freedom, loyalty, and love down my right arm.