Many people who enjoy restrictive sensations crave the feeling of being immobilised, and there's no better way of doing that than a bondage body bag. They're available from a wide range of BDSM retailers, and they're one of the most complete and restrictive forms of full-body bondage available. The most important safety consideration with them is to ensure that the wearer is continuously supervised - it's not safe to leave someone so helpless alone for even a moment, as any number of things could occur. If you have that covered, though, wearing a bag like this can be a fantastically sensuous and comforting experience.
Many people think of body hair as being inherently unattractive, but that's definitely not an absolute truth. There are loads of others who are hella into it, in all kinds of different ways - the scents, the textures, the ability to change up styles and colours. Then there's facial hair, of course; plenty of people love a good beard, and different ways of shaping yours can have a huge effect on your look and demeanour. Just make sure you're not being unduly pressured by outside influences and that your facial hair is styled the way you like it.
Tattoos and piercings are the first things that spring to mind when most people think about body modification, but there are other forms as well. Branding, scarification, tightlacing and even (for some people) weight loss or gain are all essentially body mods. Permanent or long-term semi-permanent alterations people make to their physical bodies to better express on the outside who they feel like on the inside. Occasionally it can be rooted in low self-esteem or self-harming behaviours, but for most people who are passionate about body mods, it's more like a form of artistic expression - something to be indulged, enjoyed and explored.