Final answer:
The statement that human sexuality and the concept of deviance are determined by societal definitions rather than the acts themselves is true. Sexual norms vary across cultures, highlighting the social construction of sexuality.
So, the correct answer is a) True.
Step-by-step explanation:
Human sexuality illustrates how a group's definitions of an act, and not the act itself, determines whether or not it is considered deviant is true. Norms and values regarding sexual behavior vary greatly across different societies. What might be considered normal or acceptable in one culture can be seen as deviant in another. The definition of deviance is socially constructed and reflects a society's norms, mores, and values.
For example, attitudes towards premarital sex, sexual consent, and homosexuality can differ significantly. Likewise, almost all societies have an incest taboo, although the specific relatives considered off-limits can change from one culture to another. It's important to note that sexuality in a society is shaped by various factors including family, education, media, and especially religion, which historically has exerted a strong influence on sexual norms and attitudes.
So, the correct answer is a) True.