What happens if you never shave your legs?

I'm assuming the asker of this question is a female, and there's a few possible answers to your question, depending on some factors.

If you never shave your legs, hair will grow and your genetics will dictate how thick and long it will be. Some women choose to never shave their legs and are perfectly happy with this decision, despite any social implications.

In the United States, women have regularly shaved for about 100 years, the fad ebbing and flowing with the length of skirts. There's the notion that hairlessness is related to ideal femininity or youth.

Some people view a woman's unshaven legs as "disgusting", which is social conditioning and comes down to personal preference, similar to that of a man keeping a very long beard.