There have been numerous studies on the prevalence of homosexuality which show that the population of people who choose to be gay is around 1-5% or so.
1.0% — The percentage of Canadians aged 18 to 59 who reported that they consider themselves to be homosexual (gay or lesbian). 0.7% — The percentage of Canadians aged 18 to 59 who reported that they consider themselves to be bisexual.
# A study of 5,514 Canadian college and university students under the age of 25 found 1% who were homosexual and 1% who were bisexual. (King et al., 1988).
# A study of 8,337 British men found that 6.1% had had "any homosexual experience" and 3.6% had "1+ homosexual partner ever." (Johnson et al., 1992).
# A French study of 20,055 people found that 4.1% of the men and 2.6% of the women had at least one occurrence of intercourse with person of the same sex during their lifetime. (ANRS, 1992).
# A Danish random survey found that 2.7% of the 1,373 men who responded to their questionnaire had homosexual experience (intercourse). (Melbye, 1992).
# The National Health Interview Survey does household interviews of the civilian non-institutionalized population. The results of three of these surveys, done in 1990-1991 and based on over 9,000 responses each time, found between 2-3% of the people responding said yes to a set of statements which included "You are a man who has had sex with another man at some time since 1977, even one time." (Dawson, Hardy, 1990-1992)
# In a random survey of 6,300 Norwegians, 3.5% of the men and 3% of the women reported that they had had a homosexual experience sometime in their life. (Sundet et al., 1988).
3 percent of men and less than 2 percent of women are exclusively homosexual (Laumann et al. 1994).” (Herdt, Same Sex, Different Cultures: Gays and Lesbians Across Cultures, p.52-53)