http://journals.lww.com/stdjournal/Abstract/2007/10000/Changes_in_Sexual_Behavior_and_STD_Prevalence.16.aspx
http://jama.jamanetwork.com/article.aspx?articleid=192876
http://www.cdc.gov/std/stats11/adol.htm
Look at anything in the very last link. You'll find percentages for MSM around 10% for some of them, and 4-6% for others like females. MSM is estimated to be AT MOST 10% of the population, making it 1% of the population as having it, whereas 4-6% of 51% of the population (females) is double to triple that.