While a cultural argument can be made for this observation, particularly where unmarried males and females are concerned, and media, the question suggests that the person posing it is not married.
Sorry Douglas - I don't understanding what you mean? Men have dominated sex research and men boast about female orgasm much more than women ever do. I have been researching sexuality for many years. Women rarely comment but men think they know how women respond sexually despite their ignorance of the research finding that female orgasm is associated with female masturbation. The clitoris has never been associated with heterosexual lovemaking until recent decades when men have been told that clitoral stimulation assists with female arousal. My own experience is that a woman is not aroused with a lover. This explains why women leave all the stimulation to men. There is no orgasm by any means otherwise couples would have discovered the clitoris without scientists telling them about it.
Jane, I wholly agree with your comments. My introductory general mention of cultural elements was, unsuccessfully, meant to address the particulars you raise. Both men and women are subject to these biases, and the men far more so. Perhaps due to my academic surrounds the married couples with whom I interact display a balance of respect and power, and in the few discussions of sexuality I have been party to, women seem as empowered as men, however this is admittedly a skewed sample.
Now my turn for not understanding: you stated "My own experience is that a woman is not aroused with a lover." Either gender or situation?
Thanks for your support Douglas. I have masturbated regularly throughout my life from the age of 17. The use of explicit erotic fantasy is critical to achieving orgasm. If I cannot generate the necessary arousal nothing happens. There is no hormonal or biological response that men experience. At no other time, with a lover or during the day, am I aware of any arousal of the kind that would lead to orgasm. I have come to appreciate that my use of fantasy during masturbation involves identifying with the role of the role of the penetrating male. Being the receiver in intercourse is not arousing at all. The role facilitates the orgasm of the penetrating male. If a man imagines being the receiver, he may appreciate the difference between being the penetrating male and being the receiver of male ejaculate.