The parts of culture (i.e. language, media and cultural ideas) that support the rape and sexual assault of - largely - women.
The misrepresentation of why rape and sexual assault occur.
Examples include the practice of catcalling on the street, blaming victims for their appearance or previous sexual histories as the cause of rape, the general acceptance that women owe men their bodies or time and even the ways in which we encourage the male sexual appetite and discourage that of women.
Convincing someone to engage in sexual relations rather than accepting an initial rejection contributes to rape culture.
After buying her a drink at the bar, the man assumed the woman would sleep with him and confronted her when she did not. His language was full of negative remarks that construct our rape culture.
See also Rape Myth.