| 1 | Sexual reproduction couldn't happen without the sexual organs called the gonads. | |
| 2 | The physiological significance of change of sex steroid levels after coitus will obviously require further investigation. | |
| 3 | It's called gonadotropin-releasing hormone, or GnRH for short. | |
| 4 | The technium is geared to keep expanding the technium. Technology has trained us, its parents and its gonads. | |
| 5 | Next, you'll start using injection medications, called gonadotropins. |