bmjopen.bmj.com/content/4/8/e004996.full
The link goes into much more detail but the gist is:
"First, some men's narratives suggested that mutuality and consent for anal sex were not always a priority for them. Interviewees often spoke casually about penetration where women were likely to be hurt or coerced (“you can rip 'em if you try and force anal sex”; “you just keep going till they get fed up and let you do it anyway”), suggesting that not only do they expect coercion to be part of anal sex (in general, even if not for themselves personally), but that many of them accept or at least do not explicitly challenge it. Some events, particularly the ‘accidental’ penetration reported by some interviewees, were ambiguous in terms of whether or not they would be classed as rape (ie, non-consensual penetration), but we know from Jack's interview that ‘accidents’ may happen on purpose.
Second, women being badgered for anal sex appears to be considered normal.
Third, the commonly circulating ideas that ‘everyone’ enjoys it, and that women who do not are either flawed or simply keeping their enjoyment secret, help support the erroneous idea that a man pushing for anal sex is simply ‘persuading’ his partner to do something that ‘most girls would like’. Even Alicia's narrative contains some of the apparently coercive features of anal sex that other women report in negative terms, despite Alicia reporting enjoying anal sex.
Fourth, anal sex today appears to be a marker of (hetero)sexual achievement or experience, particularly for men.18 The society which our interviewees inhabit seems to reward men for sexual experience per se (‘every hole's a goal’) and, to some extent, rewards women for compliance with sexually ‘adventurous’ acts (enjoyment signifying not being naive, unrelaxed, etc), although women must balance this with the risk to their reputation. Women may also be under pressure to appear to enjoy or choose certain sexual practices: Gill describes a ‘postfeminist sensibility’ in contemporary media, where women are expected to present themselves as having chosen behaviours that conform to a stereotype of heterosexual male fantasy.24 The common portrayal of anal heterosex in terms of men breaking women's resistance can be compared with narratives about first vaginal intercourse25 and perhaps have superseded them to some degree in the British context where premarital vaginal intercourse is considered normal and so perhaps less of a ‘conquest’.
Fifth, many men do not express concern about possible pain for women, viewing it as inevitable. Less painful techniques (such as slower penetration) were rarely discussed."