Didn't we have this thread?
I thought we concluded that virgins are perfectly capable of writing porn, same way people who've never met aliens can write scifi, or 20th century writers can write about Napolean, Shaka Zulu and Julius Caesar, or perfectly law-abiding citizenry can write about murder, rape, child abuse and reality television.
On the other hand, SOME writers are so dreadful at sex scenes that one can only HOPE they have never inflicted those ideas on another human lover.