Most sexual reproduction in the animal world is facilitated through opposite-sex sexual activity, although there are also animals that reproduce asexually, including protozoa and lower invertebrates.
Sebagian besar proses reproduksi di dunia binatang difasilitasi melalui hubungan heteroseksual, meskipun ada juga binatang yang bereproduksi secara aseksual, seperti protozoa dan hewan tak bertulang belakang berderajat rendah.