I was flipping through a psychology book one day, and I came upon the sexuality section, and it said that a test was given to women and men where they recorded the part of their brain that controls sexual feelings, and they showed the participants different pornography. Almost all of the women, straight, gay, or bisexual, showed activity in their brains when looking at women. The gay women showed no activity when looking at men. Men, on the other hand, well straight men only showed activity when looking at women, and gay men only showed activity when looking at men. The book implied that there are very few truly bisexual men, and very very many bisexual women.
我覺得「有性反應」 同「雙性戀」係兩個概念。喜歡同性嘅身體甚至對同性性行為產生快感，也可以係無感情基礎之下產生嘅。雖然女生係性反應上面比較偏向在感情基礎上「加持」。