Final answer:
Based on Kinsey's 1948 study, approximately 37% of the male population experienced a homosexual encounter. This figure comes from a much older study and attitudes and willingness to report may have changed since then.
Step-by-step explanation:
The correct answer to the question regarding the percentage of men who have had at least one gay experience during adulthood is approximately 37%, based on the influential study Sexual Behavior in the Human Male published in 1948. This seminal work by Alfred Kinsey and his colleagues found that 37% of the male population had experienced a homosexual encounter, questioning the perception of homosexuality as rare or abnormal.
But it's worth noting that Kinsey's research is quite outdated, and more recent studies may provide different figures that reflect current social attitudes and greater willingness to report such experiences. Furthermore, the data about the population that identifies as gay or lesbian fluctuates between 3% and 10%, yet these figures do not necessarily correlate with having a single gay experience, as sexual orientation and sexual behavior can differ.