Demographics of sexual orientation

In general, surveys quoted by anti-gay activists tend to show figures nearer 1%, while surveys quoted by gay activists tend to show figures nearer 10%

The mean across modern surveys is a bit lower than half of the 10% quoted by Don Firth.

That's a fairly good Wikipedia article telling about the difficulties and pitfalls of such type of research. It is interesting to note that even in the same country surveys just one or two decades apart can lead to very different results.

There are data from many more countries than just the USA and the variance of results between countries is comparable to the variance within countries. That makes the generalisation to other countries not yet studied a fairly safe one.

Wolfgang