I’m going to quote myself here, since I actually just posted this not too long ago in the “True Average” thread…
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These more specifically relate to girth (as they are mostly looking at best condom fit), but the studies mentioned do include length.. The Condom Size PDF in particular has a lot of good data and analysis from *many* global sources and includes a fantastic listing of references and other studies at the end.
Long story short — it seems the average girth is around 4.8, and average length is around 5.8” bone pressed in non self-measured/self-reported studies.
Seems to be pretty close to all the other major studies Goomba has posted up involving erections (ie, not flacid stretched) measured by a 3rd party.