The percentage of teenage males who have ever had sexual intercourse has declined since 1988, while the use of contraception at first intercourse among teenage males increased, according to new data from the 1995 National Survey of Adolescent Males. These findings parallel trends for teenage girls measured in the 1995 National Survey of Family Growth. The consistency of results for teenage boys and girls provides greater confidence in the findings from both surveys. These data are compatible with the recent decline of births to teenage girls. In general, they indicate that American youth have become more responsible in both their sexual and contraceptive behaviors.