Sex enhancement drugs are there and they work. Men have been known to suffer a condition known as erectyle dysfunction especially with advancing age. Under such circumstances,a man may have an erection not strong enough to stand a sexual activity. This could be a result of age,physical/psychological health or just anxiety!
Drugs such as Cialis and Viagra have the ability to increase blood flow into the penile area. The problem with the much hyped about herbal concoctions (advertised daily in DN newspapers) is that they either have higher dossages of the active ingredients,lower dossages or none at all.
As for size,physical exercise in the gym will do a good job,after all penis is predominatly muscle fibre!
For proffessional help,look for a medical practitioner,a Urologist for that matter.
Chief