NCBI Bookshelf. The initiation of sexual intercourse is an important topic in the study and prediction of fertility. In their theoretical analysis of fertility and its determinants, Davis and Blake argued that socioeconomic and other factors affect fertility only through its proximate determinants, that is, through exposure to sexual intercourse, exposure to conception, given intercourse, and gestation and successful parturition, given conception. Since under all but exceptional circumstances, conception does not occur without it, sexual intercourse is the first of these proximate factors to be examined. In the past, fertility was studied primarily within marriage. This was not only due to the difficulty of obtaining information on sexual behavior, but also to the assumption that intercourse takes place primarily within marriage.

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Rough sex is often the topic of heated debates, with many categorizing it as abuse and others categorizing it as a legitimate fetish. How old are you? Woman A: Twenty-seven. Woman B: Twenty-three. Woman C: Thirty-four.
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From a year-old girl convinced to perform a sex show for an older man over webcam, to a year-old boy who tied up his girlfriend because 'on the videos they seem to like it', adolescents are becoming sexualised younger than ever. Experts are concerned about the impact of pornography on young Australians as more and younger teenage women are sustaining injuries from 'rough sex'. Ms McLean said while the injuries have been an issue she has been dealing with over the past five or six years, the age of those engaging in such activity had lowered dramatically. She added that 94 per cent of this aggression is directed towards women, something which is having a detrimental effect on the shaping of young people's sexuality. Young men are often trying to recreate what they have seen online in mainstream pornography, which is often aggressive towards women. Ms McLean recalled a police report she had seen detailing an incident between a year-old boy and his girlfriend, as an example of young people mimicking pornography.
Pornography is not new, but the internet has made it so accessible that it's become the main sex educator for many teenagers. Research shows that nine out of 10 boys aged years, and 60 per cent of girls in the same age bracket, have seen online porn, according to the University of Canberra. What young people are seeing in porn is shaping their sexual imaginations, expectations and practices, she says.