That said, I thought I might give you something "light" and, hopefully, enlightening.
The next time someone says "It's not natural!" or "It goes against nature", show him or her this photo:
Max, the older kitty, is on the left. Marley, who was ricocheting off the furniture and walls just a few minutes before I took this photo, is on the right.
All right, I shouldn't make assumptions or cast aspersions on them. So, I'll just assume that their union is a meeting of the minds: