Penis Exercises aren't that new or outrageous, although they are heavily disputed by the professional medical community. However it seems to me they turn a blind eye to hundreds of men on non-profit forums who insist upon results, and permanent at that.

Although you claim to have gained 2 inches in 3 months, I'm very tempted to say 1. It won't be permanent, 2. You're measuring very gratuiously 3. You're lying...?

Generally, the rate that's considered normal is about 1" in 7-12 months, from stretches and a sort of milking procedure. The 'science' is basically that the penis adapts to the consistent stress during days off. DO NOT attempt to do anything without proper guidance, if you are really interested have a browse (google it) at Thunders place, a decent non-profit forum dedicated to the stuff.