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Diabetes:

Urinary Tract Infection
Diabetic patients show an increased rate of urinary tract infection. 2012|volume=79|issue=1|page=86|url=http://www.sciencedirect.com/science/article/pii/S0090429511023557|accessdate=28 November 2014}} The main culprit is bladder dysfunction that is more common in diabetics than in non-diabetics due to diabetic nephropathy. When present, nephropathy can cause a decrease in bladder sensation, which in turn, can cause increased residual urine, a risk factor for urinary tract infections.

Diabetes and Sexuality
Sexual dysfunction in diabetics is often a result of physical factors such as nerve damage and/or poor circulation, and psychological factors such as stress and/or depression caused by the demands of the disease.

Males
The most common sexual issues in diabetic males are problems with erections and ejaculation: "With diabetes, blood vessels supplying the penis’s erectile tissue can get hard and narrow, preventing the adequate blood supply needed for a firm erection. The nerve damage caused by poor blood glucose control can also cause ejaculate to go into the bladder instead of through the penis during ejaculation, called retrograde ejaculation. When this happens, semen leaves the body in the urine." Another cause for erectile dysfunction are the reactive oxygen species created as a result of the disease. Antioxidants can be used to help combat this.

Females
While there is less material on the correlation between diabetes and female sexual dysfunction than male sexual dysfunction, studies have shown there to be a significant prevalence of sexual problems in diabetic women. Common problems include reduced sensation in the genitals, dryness, difficulty/inability to orgasm, pain during sex, and decreased libido. In some cases diabetes has been shown to decrease oestrogen levels in females, which can affect vaginal lubrication.

Oral contraceptives can be taken by diabetics. Sometimes, contraceptive pills can cause a blood sugar imbalance, but this usually can be corrected by a dosage change. As with any medication, side effects should be taken into account and monitored to prevent serious complications with diabetes.

UTI:

Symptoms
"Voiding symptoms, which are caused by lower urinary tract obstruction, include slow stream, splitting or spraying, intermittency, hesitancy, straining, and terminal dribble."

"Painful urination (dysuria) is discomfort or burning with urination, usually felt in the tube that carries urine out of your bladder (urethra) or the area surrounding your genitals (perineum)."

Females
Heteronormative sexual intercourse can increase risk of a urinary tract infection in females in several ways. Within 24 hours of intercourse the risk of bacteriuria increases. Certain sexual practices, such as the use of spermicides, can increase the susceptibility to UTIs by killing the lactobacilli normally found in the vagina. Lactobacilli are protective because they can competitively exclude E Coli, which is the primary bacterial cause of infection. In addition these lactobacilli also decrease vaginal pH and by producing hydrogen peroxide, which is effective in killing many bacteria. As the frequency of intercourse is also a factor in the likelihood of getting an infection, women who suffer from recurring UTIs are often encouraged to take prophylactics after sexual intercourse. Other contraceptive practices such as the use of diaphragms or oral contraceptives are also associated with urinary tract infections.

The decrease in estrogen caused by menopause can increase susceptibility to urinary tract infections. Estrogen nurtures robust vaginal microbiota as well as the protective epithelium of the bladder. Additionally, the vaginal atrophy that can sometimes occur post-menopause is associated with recurrent urinary tract infections in females.

Males
Males get urinary tract infections at a significantly lower rate than women. However, once an infection has occurred, males may experience a list of uncomfortable sexual dysfunctions. Men with urogenital infections, including urinary tract infections, are at higher odds of having pain with ejaculation and having problems with affected sperm, in the most severe cases causing problems with fertility. In men with chronic bacterial prostatitis, characterized by recurrent UTIs, symptoms may be more severe and also include pelvic and/or genital pain and hemospermia, a condition in which blood is found in the seminal fluid.

Others
...Other risk factors include diabetes,[1] ... Diabetics show a higher rate of urinary tract infections than do non-diabetics for a couple of possible reasons: First, higher glucose levels in urine create a more hospitable environment for bacteria, and second, some side effects of diabetes, such as nephropathy, create problems emptying the bladder.