What Was the General Finding of the First Study to Compare

What was the general finding of the first study to compare sexual communication in mixed-sex and same-sex couples?

A) Same-sex couples had more positive sexual communication.
B) Same-sex couples had more negative sexual communication
C) There were no differences in the sexual communication patterns in same-sex and mixed-sex couples in the sample.
D) Same-sex couples discussed sex more, but the nature of these discussions was very similar to that of mixed-sex couples.