Final answer:
Most familial sexual contacts are not one-time occurrences; this is a misrepresentation of the incest taboo that prohibits such relations across cultures.
Step-by-step explanation:
The question asks whether most familial sexual contacts are one-time occurrences, to which the answer is false. Familial sexual contacts, which fall under the broad term of 'incest', are prohibited by the incest taboo, a cultural norm universally found across all societies. These norms dictate that sexual relations between family members, particularly parents and offspring, and sometimes other close relatives, are unacceptable.
It should be noted that how incest is defined can vary widely from culture to culture, and what is considered acceptable in one society may be taboo in another. This complexity means that familial sexual contacts can't be encapsulated in a single incidence pattern across different societies.
In terms of incest taboo, societies often have laws such as those in the United States that regulate sexual relations and marriages between first cousins, where the legality varies by state.