I say that as one who has struggled with this in the past as well. Not everything we take as dirty menstruation, in certain traditions really is. I notice a very high number of couples, of educated men and women with half of the couple in their twenties, the other half in their forties. Condom use for both types of sexual behavior, anal sex and fellatio, was lower among 20—year-olds. It's the problem of experimental study. Details of the survey design and sample have been published elsewhere [ 29 , 36 , 37 ]. Thank you for that suggestion! Does the study address where "sex culture" is headed in the future? Those who cannot suffer any pain, particularly short-term pain, doom themselves, ironically, to a painful existence. Researcher David Buss and his team have found that women, for example, list other reasons to have sex; some are obvious love, pleasure, horniness , others less so boredom, revenge, insurance against the departure of a boyfriend. That, of course, is a subjective question. It would be beneficial to track the prevalence of heterosexual anal and oral sex and associated condom use on a more frequent basis. He wanted to try a variety of positions and things and drag it out. Still need help thinking through these things or talking through them with your husband? The author Toni Bentley, in her strange and compelling book Surrender from , describes the experience as a deeper, more meaningful penetration, "on the edge of sanity" Also, the survey reveals that sex is more a spontaneous act rather than a pre-determined activity for both men and women.