Found the source, and it's from the not at all biased against gays
exodusglobalalliance.com which sources a book from 1978, which was criticized for being outdated and not having a broad enough sample like i said before.
A UChicago study found that in the past 12 months the average straight man reported 1.8 partners while gays reported 3.1 . Hardly that much of a difference
