One of the purposes of jewelry is to enhance looks. It can serve to draw attention to specific features.

Now, there is a disclaimer needed here. I’m hetero. So I have no sexual attraction to the male form. However, I’ve dabbled in multiple forms of art, and used to jang around weight rooms with some bodybuilders among the mix. So you either learn to appreciate the male form or you GTFO of both of those PDQ.

Necklaces can very much enhance a chest/torso. It’s all about the kind of necklace. Understated is usually best. A single pendant, with the chain/string/whatever being are the right length is going to pull the eyes to the center of the chest most of the time. This can be a very good thing. You adjust the length to match where you think that extra attention is going to give the best visual, and you’ve succeeded in jewelry.

Even a very fine chain can also give a visual break. Depending on the hair situation, chests can actually be boring to look at. A lot of hair, and it’s a visual sameness just like a total shave is. You need light and shadows, variances in tone. If you don’t have that naturally, you can supply it with jewelry (works with piercings too, btw). I’m a fucking sasquatch, and there’s more visual interest when I’m wearing even something utilitarian (a keychain sized flashlight is damn handy on a chain) rather than jewelry.

So I’m not surprised you prefer the looks when wearing your necklace. Makes total sense.

Now, sexy is as sexy does. If someone is into necklaces as a paraphilia, or just as a mild nicety, you can’t really judge whether the jewelry makes you look better or not. Most people I’ve ever heard talk about male jewelry at all leaned towards a little being enough, rather than any specific type.

But, yeah, I’ve seen enough dudes shirtless to have the opinion that a tasteful piece hanging somewhere on the sternum is sexier than without, most of the time. Doesn’t turn me on, but that’s not necessary to have an opinion about sexiness per se.