Men report far fewer acts of intercourse than sexually active women

Evidence

But now 21% of the males were virgins, and 22% of the females. But the fellows were still far behind in number of acts of intercourse; their median equaled 95, while that for the sexually active women was 170. (The figures two years earlier had been 45 and 95, respectively; so over the two intervening years the men had averaged about 50 more acts of intercourse, and the women 75. The latter were probably still more likely to be involved in long-term relationships, where most intercourse occurs.) — Bob Altemeyer, The Authoritarian Specter, 4232