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1.
Sexual Chi-Kong
Tennis requires concentration, patience,
timing, and strategy. The same goes for sex. ... 
2.
Herbal Remedy
A
concoction touted as an "herbal Viagra" without the side
effects has shown it can prevent impotence in rats...

3.
Prescription Medicine
Sildenafil works by increasing blood flow
to the penis, as well as causing penile muscles to relax. It does
not initiate an erection, but enhances penile flow in ... 
4.
Vacumm Devices
This is the least invasive method of all, involving no medication
or surgery. It works by placing a cylinder with an attached pump
over the penis ... 
5.
Hormonal Therapy
These forms of therapy are strictly recommended only for cases
of hypogonadism, i.e, a pathological decrease in the levels of testosterone,
and even so in very limited circumstances ... 

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