Erection, ejaculation and orgasm

These events are related but distinct: an erection does not necessarily imply orgasm or ejaculation.

Erection combines nerve signals, tissue relaxation and blood flow into erectile bodies.

Ejaculation moves genital secretions and then expels them; orgasm is a sensory and brain experience.

Vascular health, medicines, hormones and psychological context can contribute; persistent difficulty deserves assessment.