I keep seeing references to Janet Jackson's 'boob.' I hear that word once every two years, why use it now? Is 'breast' too polite and 'tit' too vulgar? Nipple is too sexy. On a similar note try this. Ask your friends, male and female, for a common street term for the male member. Make a list and separate out 'cock' and organize the list by sexual preference. I think you'll find that those who chose that word are more likely than not to have had one in their mouth at one time or another. 'Dick' for example, will have a much smaller correlation.