Importantly - the generation methods do not contain reciprocal discharge mechanisms.
For discharge to occur the conditions for discharge need to be met separately. If they are not met - eg warm dry conditions with good insulation to other differentially charged objects then discharge will not occur. Charge will accumulate on the capacitor that the body forms relative to ground. For a given amount of charge, the lower the capacitance the higher the voltage. (Halve capacitance and voltage increases by 1/2th power.)
$$
Q={C \over V}
$$
$$
E={1 \over 2}C V^2
$$