Final answer:
The provided materials do not directly answer the question about the specific number of adult Americans who consider themselves abstainers, but describe general attitudes towards sexuality, health, and political engagement which may pertain to abstention choices.
Step-by-step explanation:
The question 'About how many adult Americans consider themselves abstainers?' seems to be related to behaviors or attitudes towards certain practices, such as abstaining from alcohol, sex, or other activities. While the material provided does not directly answer the question regarding abstainers, it offers insight into the general attitudes of Americans towards sexuality and other actions which people may abstain from. For instance, the material indicates that Americans have various opinions on matters of sexuality, health, and political engagement, some of which might influence an individual's choice to abstain from certain activities. Moreover, sexual practices and attitudes towards them vary, as well as participation in traditional forms of political activity, which may reflect broader notions of abstention within the U.S. population.