Vibrator (device designed to stimulate a woman's genitals).
Back-of-the-book; denoting those stamps in a catalogue that are not used for the payment of regular postage fees, and are displayed separately in the catalogue after that listing; the division between these two groups varies with the publisher.
Sexual virility: the ability to become erect or achieve orgasm.
Concentration; strength
Potentiality, ability, capacity.
Power, authority.
The ability or capacity to perform something