Total side note: A few years back, I was experimenting with putting probiotics on my skin to help with acne. The first time I did it, I went to class (performing literature... a weird communications elective in college), sat by myself like normal, then a few people in the class who never talked to me made a point to come sit by me. It was weird and could have been a coincidence.
But, I did find some research a few years later than matting pattens in fruit flies is strongly influenced by the bacterial flora of the flies. I also noticed that girls who are vegan and eat raw foods always tend to have a weird aura to them that attracts a lot of people, so I have a strange suspicion that intestinal flora actually has a strong influence on how "attractive" a person is or is not.