There are in the sex market lots of pills, creams, herbs, etc, that promise you a thicker penis. I don´t know its results, but honestly I can assure you that without spending any money you can increase thickness through jelking exercises up to reaching a monster cock. The only drawback is time. You can spend years exercising day after day, but the results are for ever and you can see the effects month after month. In my case I have been jelking more than 10 years, but the results are here.