Here are some of my favs from tryingyouout:

http://www.reddit.com/r/gonewildaudio/comments/1md6q7/m4m_experimentation_in_three_parts/
http://soundgasm.net/u/tryingyouout/A-little-bicuriousity
http://soundgasm.net/u/tryingyouout/My-first-experience

If you're into the incest stuff, this would be my pick:

http://soundgasm.net/u/ohtwocount/Late-Night-with-Dad