I dislike the smell of BO and usually of other people, or even my own BO.. but after starting on this raw diet, I have noticed that my smells have completely changed, my breath no longer stinks and my sweat does not smell as bad, actually almost smells sweet, and even when i use the toilet the smells are not as bad. Because of my changed scents, I have decided to try washing with only water and nothing else, no soap whatsoever, and see how that goes. I think that an unhealthy SAD diet reflects in the odors from people, which is why most people do not like the smell of others, possibly because it signifies "unhealthy." You can smell how unhealthy they are in their sweat and it doesn't smell good. However, there are times I do like or don't mind the scent of other people, usually family who I have lived together with, and I do like the idea of being able to know people more intimately by their scent, but there aren't many people that I actually like, and those I really dislike are ones whose scent I would really never want to smell. I also have noticed that the scents of men are usually far more powerful and noticeable than the scents of women.
I do not have a boyfriend or anything, but I do know that there was a study done where women would smell the shirts of a bunch of men who wore them while sleeping, without any sort of colognes or scented anything so that it was just their natural scents. What they discovered was that the women were most attracted to men's scents who had completely different immune systems from their own, so that, if based on scent alone, women would be more likely to choose a mate with whom they would produce the strongest immunity in any child they bore. I also heard that women who were taking birth control did not assess the scents of their mates properly, and that once going off birth control could lead to a disliking of their mate's scent if their immune systems were too similar, and therefore lead to a possible dislike of the mate themselves.
I'm pretty sure there are a load more things we could know from scent alone, but we're just out of practice with it since everyone washes with soaps and wears deodorant and perfumes/colognes, and even when they don't their scent is likely masked with the bad scent of unhealthiness.