Were there any early Christians who defended non-procreative sex as licit?
Having read through quite a bit of the Ante-Nicene Church Fathers, I can't remember ever seeing anyone advocate for non-procreative sex. Rather it was common to advocate for remaining a virgin for life.
I think if anyone in the early church did advocate for non-procreative sex, you are more likely to find them among those whom the Church Fathers debated against and labeled as heretics.
Keep in mind, also, that they didn't have condoms back then or the concept of "safe sex." And there most certainly weren't any church fathers advocating for homosexuality - which would contradict the scriptures (and the early church fathers drew heavily from the scriptures).