Erection
PHYSIOLOGICAL PHENOMENON
Hard-on; Erections; Bonerfied; Hard on; E-rection; Erect cock; Penile erection; Surgation; Erect penis; Male erection; Erection (penis); Penis engorgement; Trabecular smooth muscle; Painful erection; Spontaneous erection; Penile tumescence; Erectile function; Erectile capacity; Unintentional erection; Erectile potency; Hard penis; Peeing while hard; Hard cock; Hard dick
An erection (clinically: penile erection or penile tumescence) is a physiological phenomenon in which the penis becomes firm, engorged, and enlarged. Penile erection is the result of a complex interaction of psychological, neural, vascular, and endocrine factors, and is often associated with sexual arousal or sexual attraction, although erections can also be spontaneous.