Erection, intromission, and ejaculation
1. Vascular, neurological and endocrine systems work together
2. Erection: contraction of the ischiocavernosus muscle -> occlusion of venous outflow
3. Relaxation of corpus cavernosum and corpus spongiosum via parasympathetic nerve
4. Intromission: mounting behaviour
5. Emission: release of spermatozoa and accessory gland fluids into the pelvic urethra
6. Ejaculation: forceful expulsion of semen from the urethra
7. Post-ejaculation: increase in the smooth muscle tone of the cavernous space -> increase of outflow of blood, contraction of the refractor penis muscle withdraws the penis into the prepuce