The only benefit to not fixing your animal is that you don't pay for it. In the long run it is better to spay or neuter your pet since without fixing, your animal may get ovarian or testicular...
1 Neutering is non-invasive, so the male won't even bat an eye. Spaying used to be fairly invasive, but because of modern breakthroughs and technology, spaying has become a minor procedure. With...
They think they're "messing with nature". One of my aunts was like that with her first 2 male dogs, and I didn't get too close to them because they "humped"!