Wherefore God also gave them up to uncleanness through the lusts of their own hearts, to dishonour their own bodies between themselves: God - gave them up, etc. - They had filled up the measure of their iniquities, and God, by permitting them to plunge into all manner of irregularities, thus, by one species of sin, inflicted punishment on another.
Dishonour their own bodies - Probably alluding here to what is more openly expressed, Romans 1:26, Romans 1:27.
Between themselves - εν εαυτοις, Of themselves, of their own free accord; none inciting, none impelling.