Dickleaker has the basis in Penis Enlargement to understand what he's talking about with respect to 'inner penis'. However, I feel this subject becomes immediately misunderstood by newcomers. The portion of penis which resides inside the body is not being pulled out of your body. You are not re-arranging your anatomy with Penis Enlargement. The concept originated with the BTC type stretching and the effects it rapidly achieved. Actually, by stretching your suspensory ligaments you acquire increased usable length by lowering the "exit point" and somewhat straightening the line between the inner and outer. As hangers will tell you, some of this length is simply an illusion. But a very acceptable one because lowering the exit point gives the visual of a much longer penis than has actually been obtained. This is where the expression "pulling out the inner penis" originated, but the fact is: it hasn't moved. The stretched ligament produces less of a limiting factor.
Keep in mind that long before your body would allow a portion to be removed by pulling, it would either rip or grow. You cannot relocate parts of your body. Besides, if you could externalize the inner portion, what would replace the space it would leave behind? Growth occurs slowly and your body would not appreciate the idea something is being removed. It actually sees this on a minute-by-minute basis as stress. Stress causes several reaction stages in the order of efficiency: 1) strengthening 2) thickening 3) stretching 4) growing. Each method is tried until it fails, leading the body to move to the next most efficient over time. Growth is the least efficient, so it is the last resort*. Strengthening is the first and is the reason many newcomers give up after a couple of weeks or so: they never get past this stage. Also, it must be understood different tissues have different reaction times. For example, skin moves through the stages quickly whereas ligaments tend to take much longer. Skeletal muscle is in-between the two. According to the medical community, smooth muscle should not be stretched. Likewise, in the interest of efficiency the body will re-absorb some or all gains when the stress is removed: just as it does with bodybuilders**.
There are four significant factors which limit the size of your erect penis: 1) attachment ligaments/septum 2) the smooth muscle of the tunicae 3) healthy blood pressure 4) excitement level
Items 1 and 2 are easily stretched with force over time. Item 3 can be increased with exercise. Item 4 can be increased by eliminating masturbation.
Anything which pulls from the glans pulls the entire penis. The glans is firmly attached via the septum which in turn is attached via ligaments. There is no such thing as pulling only a portion of the penis, the glans must transfer its experienced force to the septum which in turn must transfer the force to the ligaments which then transfer it to the bone. Some of the force is dissipated along the way, but it must take this route. For example, you can't pull just a section of a rope, no matter what: it transfers all the way to the other end. Pulls can feel differently, but it doesn't mean they're working better or worse than another with respect to inspiring growth. After years of Penis Enlargement, I can comfortably say that I've gained without feeling anything in particular and I've been sore as hell without results.
*Visitors to the gym will know that muscles get stronger before they get bigger. It's more efficient for the body to create more nerve connections than it is to add muscle tissue. However, after the body has exhausted its more efficient methods, the muscle grows to accommodate the stress.
**Protein intake can also affect the speed of this reduction.
