The popular perception of Western history is that humans have grown less puritanical over time; compare, for instance, how the sight of an ankle (on a man or woman) was considered shocking in 18th and 19th-century Victorian culture. Given our current attitudes towards clothing, clearly something has shifted, as even the percentage of one's bare skin that is socially acceptable has increased linearly since then.
Yet there are some subjects that we are far more prudish about than our historical counterparts. Case in point: oral sex, which is apt to provoke squeamishness among, say, media execs and priests today. Yet ancient Egyptian priests would have eagerly and publicly conversed with you about oral sex, because it was a crucial aspect of both their culture and religion.
