Main problem in gathering statistics on gays is that many people who are homosexual do not want to admit, even to an anonymous interviewer.  This is particularly true of people in heterosexual marriages.  Probably Kinsey's 10% figure was skewed higher by some sampling problems.  The low-end figures are likely wrong due to people not being honest when surveyed.  An article in the gay press today said the British government estimated about 6% of its population was gay.
What percentage of the U.S. male population is gay?