“There is little evidence to justify the widespread assumption that willing participation in pedophilia hurts children.“
I can give you the links but it's quite easy to Google.
Edit since I dug them up for another comment:
https://stallman.org/archives/2006-may-aug.html#05%20June%20...
https://stallman.org/archives/2012-nov-feb.html#04_January_2...