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I saw this assertion on many sources, here's one:
http://www.japanzine.jp/article/jz/521/love-sex-blood-types
Many Japanese people believe that just as different blood types are incompatible, so are people of different blood types. Below is a list of different blood types, and the sexual or romantic characteristics associated with them. (long list follows)
Much like the Zodiac, this seems to be "for entertainment purposes only" at best, and a self-fulfilling prophecy at worst. Or vice versa, depending on your appreciation of pseudoscience. According to this Wikipedia article on the subject with over 40 references, the link between blood types and personality have been researched frequently, but altogether inconclusively. So for now, science says...Nope.
