It can be argued that even though it is Natural law that the default relationship for the vast majority of the species is Male-Female. It can also be argued that it is also natural that there are same-gender relationships, even bisexual relationships, are found in the wild and naturally occur, ranging from Dolphins to Bonobo Chimps. Thus it is natural that we are going to seek relationships, same gender or not.
Personally, I'm on the neutral side of this. I understand why people aren't approving of this thing, but I also don't approve of people stepping or oppressing others.