Modern science is working to show that genetics is one of the causes of being gay, although some science conflicts in this area. (read: Cure the Gay: Gay Conversion Therapy – Real or Hoax?) The reasons people are gay are both physiological and psychological. No one knows for certain why any individual is gay, but the current thought is that being gay is not a choice. In other words, 5-10% of people experience same-sex sexual attraction or behavior of course, this doesn't speak to what makes people gay. 'Of, pertaining to, or exhibiting sexual desire or behavior directed toward a person or persons of one's own sex.' The simplest answer is to look at the definition of the word 'gay.' The term gay is a synonym for homosexual, which is defined as, 1,2 Estimates as to the number of gay people in the population range from 1-in-20 to 1-in-10, so why are some people gay? Are they gay by choice or is being gay genetic?