Problem with the Results from Cross-Sectional and Longitudinal Research on the Sexual

Multiple Choice

problem with the results from cross-sectional and longitudinal research on the sexual activity of adults in the United States is that ___________.

A) the majority are no longer sexually active after midlife
B) the majority are most sexually active in late adulthood, but many die before this part of the life span
C) it reduces a complex human interaction to a simple frequency count
D) the data do not allow us to determine the answer to sexual frequency