Libido is the level of desire for sex and is influenced by a lot of complex mental and hormonal issues. Nearly always declines as one ages. Very sensitive to depression, self esteem, and/or anxiety.
The ability to achieve and maintain an erection is libido related, but heavily affected by certain medications and blood flow issues.
Ejaculation is largely the result of simple penial nerve stimulation which can be achieved by masturbation, erection not necessarily required.
There is no prostate specific medication that would affect one's libido. Testosterone supposedly can improve libido in males in certain circumstances, but can also aggravate existing prostate problems.
The first company that comes out with a pill to increase libido will make a fortune! Viagra only works if the desire for sex is adequate.
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