Psychological impact
ED often has an impact on the emotional well-being of both men and their partners. Many men do not seek treatment due to feelings of embarrassment. About 75% of diagnosed cases of ED go untreated. Causes
Causes of or contributors to ED include the following:

Diets high in saturated fat are linked to heart diseases, and men with heart diseases are more likely to experience ED. By contrast, plant-based diets show a lower risk for ED. Prescription drugs (e.g., SSRIs, beta blockers, antihistamines, alpha-2 adrenergic receptor agonists, thiazides, hormone modulators, and 5α-reductase inhibitors)
Neurogenic disorders (e.g., diabetic neuropathy, temporal lobe epilepsy, multiple sclerosis, Parkinsons disease, multiple system atrophy)
Cavernosal disorders (e.g., Peyronies disease)
Hyperprolactinemia (e.g., due to a prolactinoma)
Psychological causes: performance anxiety, stress, and mental disorders
Surgery (e.g., radical prostatectomy)
Ageing: after age 40 years, ageing itself is a risk factor for ED, although numerous other pathologies that may occur  with ageing, such as testosterone deficiency, cardiovascular diseases, or diabetes, among others, appear to have interacting effects
Kidney disease: ED and chronic kidney disease have pathological mechanisms in common, including vascular and hormonal dysfunction, and may share other comorbidities, such as hypertension and diabetes mellitus that can contribute to ED
Lifestyle habits, particularly smoking, which is a key risk factor for ED as it promotes arterial narrowing. Due to its propensity for causing detumescence and erectile dysfunction, some studies have described tobacco as an anaphrodisiacal substance.
Ears
Similar to dogs, cats have sensitive ears that allow them to move each ear independently of one another. Because of this mobility, a cat can move its body in one direction and point its ears in another direction. The rostral, caudal, dorsal, and ventral auricular muscle groups of each ear comprise fifteen muscles that are responsible for this ability. Most cats have straight ears pointing upward. Unlike with dogs, flap-eared breeds are extremely rare (Scottish Folds have one such exceptional mutation). When angry or frightened, a cat will lay back its ears to accompany the growling or hissing sounds it makes. Cats also turn their ears back when they are playing or to listen to a sound coming from behind them. The fold of skin forming a pouch on the lower posterior part of the ear, known as Henrys pocket, is usually prominent in a cats ear. Its function is unknown, though it may assist in filtering sounds. Nose
Cats are highly territorial, and secretion of odors plays a major role in cat communication. The nose helps cats to identify territories, other cats and mates, to locate food, and has various other uses. A cats sense of smell is believed to be about fourteen times more sensitive than that of humans. The rhinarium (the leathery part of the nose we see) is quite tough, to allow it to absorb rather rough treatment sometimes. The color varies according to the genotype (genetic makeup) of the cat.