Actually, homosexuality is pretty common among the Pashtuns. Can't speak about the Tajiks, Uzbeks and Hazara, but among the Pashtuns, its a pretty common part of the culture. If you read studies by anthropologists in the 60s, you will find extensive evidence of it.
Show me some unbiased sources then?
Homosexuality exists everywhere but to say that the rate is higher amongst Pakhtuns is totally false. What's your agenda? Got smacked down by an Afghan?