Instinctively, I inclined to the opposite sex partners, but to avoid provoking their jealous husband, the senses tell me to choose the same sex ones.
you are funny!
Same sex friendship needs lots of time to develop, so nearly all of them come from school mates, colleges. However, one can change a stranger of the opposite sex into his spouse.
Frankly speaking ! Many my friends often tend to choose the opposite sex person,because they can easy to find a topic！Sound may not very reasonable!
The same sex ;)
The third sex.