Another option for an “emergency” short term size increase is simply having a warm bath, a shower, wrapping your penis with a wet and warm towel or simply pulling it by hand. The blood flow increases and the flaccid size increases, too. The effect only lasts for minutes, but there are situations this may become handy, especially if you were in a cold environment before and your penis size has “shrunk” to even smaller than usual.
Stretching with weights. Weights or stretching exercises won't bulk up your penis -- it's not a muscle. But hanging weights off your flaccid penis may stretch it a bit, O'Leary says. The catch is that it requires a freakish degree of dedication. "You might have to wear a weight strapped to your penis eight hours a day for six months," says O'Leary. At the end of it, you could be lucky enough to gain about half an inch. Risks include tearing of the tissue, burst blood vessels, and other problems.