A gaff can be used to create a more feminine appearance in the genital area, typically for transgender women or crossdressers. It is designed to conceal the penis and create a smooth, flat appearance that is more consistent with feminine anatomy.

Some people choose to use a gaff to reduce feelings of dysphoria or discomfort associated with the appearance of their genital area. Wearing a gaff can help to create a more authentic, gender-affirming appearance, and may be an important part of a person's gender expression.

In addition to providing a more feminine appearance, a gaff can also help to create a more comfortable and secure fit for certain types of clothing. For example, a gaff can help to prevent visible panty lines when wearing tight-fitting clothing, or provide a more secure fit for swimwear or other types of athletic wear.

It's important to choose a gaff that fits well and is comfortable to wear, and to follow the care instructions carefully to ensure that it lasts for as long as possible. Some people may prefer to wear a gaff in combination with other forms of lingerie, such as breast forms or padded hip and butt pads, to create a more complete feminine appearance.