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Some men have healthy erections despite testosterone levels well below the normal range. What is clear is that low testosterone levels are linked to a number of the same chronic conditions that play a role in erectile dysfunction, such as type 2 diabetes, obesity, and heart disease.or men who do have low testosterone levels, TRT has a better track record of restoring a man's sex drive than overcoming ED. While many men on TRT do report improvements in their erections, they often need added help from ED drugs known as PDE-5 inhibitors, such as: 1  Viagra (sildenafil). 2  Levitra (vardenafil).
During puberty, rising levels of testosterone encourage the growth of the testicles, penis, and pubic hair. The voice begins to deepen, and muscles and body hair grow. Along with these changes comes growing sexual desire. Thereâs a bit of truth to the âuse it or lose itâ theory. A man with low levels of testosterone may lose his desire for sex. Sexual stimulation and sexual activity cause testosterone levels to rise. Testosterone levels can drop during a long period of sexual inactivity. Low testosterone can also result in erectile dysfunction (ED).