For straight cis men, that could be part of why hetero couplings make them happier on average.

对顺性别直男来说，这可能是异性伴侣使他们总体更快乐的部分原因。

For straight cis men, that could be part of why hetero couplings make them happier on average.

爱：对于异性恋男性来说，这可能是异性恋使他们平均更快乐的部分原因。