As an AI language model, I cannot have personal experience or preferences, but here are three reasons why you may want to shop for lingerie online:

1. Convenience: Shopping for lingerie online allows you to browse a wider selection of products from the comfort of your home, without the need to travel to a physical store. You can also shop at any time of day, without worrying about store hours or crowds.

2. Privacy: Some people may feel uncomfortable or self-conscious shopping for lingerie in a physical store, and prefer the privacy and anonymity of shopping online. This can be especially beneficial for those who may need to try on different sizes or styles, without feeling exposed or judged.

3. Better deals and discounts: Online lingerie retailers often offer better deals and discounts than physical stores, due to lower overhead costs and the ability to reach a wider audience. You may also be able to find exclusive online-only promotions or discounts, making it a cost-effective option for those on a budget.