Warning: this post talks about yaoi, female arousal, and methods of measuring such.

But here's an interesting factoid that I just pulled out of a book that I've been reading, Bonk: The Curious Coupling of Science and Sex. On page 253 of the paperback version, author (and journalist) Mary Roach says:
"A series of studies by Meredith Chivers and colleagues at the Centre for Addiction and Mental Health in Toronto showed that...women, both gay and straight, will show immediate genital arousal (as measured by a photoplethysmograph) in response to films of sexual activity, regardless of who is engaging in it-- male, female, gay, straight, good hair or bad. Men, contrary to stereotype, tend to respond in a limited manner; they are aroused only by footage that fits their sexual orientation and interests."
In other words, the fact that straight and gay women respond physically to BL does NOT mean that they have some kind of innate taste for the stuff. It seems to me, however, that given this information, it's not so surprising that some significant number of women, once exposed to boy-on-boy material in a positive setting (aimed at their market, probably shown to them by a friend, etc), would move from only physical reaction to psychological as well.
Of course, this is no definitive answer to the age-old "why girls like yaoi" question, but it's certainly an additional piece to the puzzle.














