The article basicly says that they can make fruitflies *** by using pheromones to the extent of trying to reproduce with each other.
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I found it kind of fascinating (sounds a bit harsh, but meh) to find out that scientist actually look at homosexual animals, including humans, in such a manner. Though it's quite natural that your brain determines stuff like being hetero or homosexual, to think that other people can change it (well probably in the near future) is kind of scary. They could make you homosexual, or turn homosexuals back to heterosexuals, which is against the free will thingie, but when you're changed, you don't even care anymore.
The nature neuroscience article thingie is here.
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[UPDATE]
http://www.science.p.../Han12-2007.htm
Too much alcohol makes you *** as well. ;)
The videos provided by the site includes mating male flies, looks more like a wierd dance to me though. O well, so you've been warned, alcohol influences your sexual preference.