It does aid many men who have problems obtaining or maintaining an erection. Most claims that I have come across have been entirely bogus. They are basically being used by unscrupulous individuals who are trying to fleece the public with their scams. They can make any unsubstantiated claims they want. A low testosterone level impacts libido.
Low testosterone is one of the determinants of sexual desire.
Testosterone is not necessary for men to be able to develop an erection, as evidenced by erections which occur in male infants and young boys before puberty. Some men who do have low testosterone levels will find it easier to get and maintain an erection when their testosterone deficiency is corrected. However, the majority of men who have erectile dysfunction are not suffering from testosterone deficiency. I am 28 yrs old. Therefore, the same measures that promote cardiovascular health will also promote sexual health.