Answer: Pornography among men. Men prefer their imagination to a real person. At least that's one explanation. The Family Research Council posts the following:
When a person's sex drive is properly channeled in the bounds of traditional marriage, it's a powerful force for good. It bonds the husband and wife to one another and gives life to a new generation. It's the foundation of the family, which is why groups like FRC cannot address issues of family structure without addressing issues of sexuality, and vice versa. But when the sexual drive isn't properly contained, it can be highly destructive--to the emotional and physical health of individuals, and to the quality of relationships themselves. A powerful illustration of how the elements of the "sexual revolution" are all interconnected was explained in a recent article in the liberal magazine Psychology Today. Dr. Leonard Sax wrote that a recent survey showed young women are almost three times as likely to consider themselves homosexual or bisexual as young men are.
Why? Well, for women, sexuality is much more "malleable" or "plastic" than for men (so much for the "born gay" theory!). While Dr. Sax doesn't address it, much of the trend lies with our culture of sexual experimentation. This "anything goes" mentality is leading to a disillusionment with traditional sexuality and, in turn, breeding more experimentation. Also, a lot of women conclude that "all the guys she knows are losers." Why are they "losers?" Because virtually all of them use pornography, and according to Dr. Sax, they prefer the fantasy world of pornography to relationships with real women. I don't think that even FRC has ever suggested that heterosexual pornography could lead to an increase in homosexuality--but when one part of our culture of sexuality becomes degraded, every part does.
In the Psychology Today article referenced above, I found the statistics about young women surprising and sad:
Psychologist John Buss estimates that for most of human history, perhaps 2% of women have been lesbian or bisexual (see note 1, below). Not any more. Recent surveys of teenage girls and young women find that roughly 15% of young females today self-identify as lesbian or bisexual, compared with about 5% of young males who identify as gay or bisexual . . .