False eyelashes (sometimes called eyelash extensions) are worn by women (occasionally men) to thicken the upper eyelashes. They are favoured by sluts and porn stars but are also worn by girls and women who wish to look sluttish or seductive. There are two main types: a strip of lashes which is applied along the entire length of the eyelid; individual lashes or groups of lashes which are applied to areas which are sparse, or at the outer part of the eyelid to achieve a particular effect. False eyelashes made of human hair may be applied by a trained beautician and these are usually designed to be semi-permanent. More usually, the lashes are synthetic and are self-applied using special glue. This type can be fairly easily peeled off when they are no longer required. False eyelashes are available in a huge variety of designs, colours, lengths and materials. Some incorporate diamante glitter or even rhinestones. Some types may be cut or trimmed to width or length.