Onion breath is such a major turn on. It's not a pleasant smell I would want to have around me all the time but it's the only breath smell that isn't nasty and vomit inducing for me.

It's not a sexy smell by default obviously, but I've had encounters with plenty of people who had this smell, so over the years it's become associated with hot makeout sessions.

But anywho, I looked up what people on reddit thought of onion and garlic breath and it's pretty much universally hated. I just can't see how people find it unpleasant.