Earlier quoted context omitted.
Not parent, but I've usually been quoted that 5% of the population is homosexual and that this number is even throughout cultures, though in some cultures it is suppressed, meaning much fewer are "active" homosexuals. It is statement that I've heard several times in academia, but am still a bit puzzled at how it was reached.
LGBT activists tend to deliberately exaggregate this number to increase their perceived importance. If you have a political ambitions then you'd better represent 5% of society, not 1.97 %.
This is unfortunately something almost everyone is guilty of (LGBT activists included). Once you politicise an issue, people begin to twist the facts, misrepresent data and select evidence that is perceived as supporting their own view point, while tossing aside evidence that contradicts it. Everyone wants "the science" to come out in their favor.