Basic Types of Sexual  Behavior

1. Sexual Self-stimulation: Masturbation

Males

In males, deliberate sexual self-stimulation can also take many different forms. In a great number of cases, the hands are indeed used. Thus, males may fondle, rub, or stroke their penis with their hands until they reach orgasm. At the same time, they may also use one hand to manipulate other erogenous zones of the body. For instance, in order to increase their overall sexual arousal, they may touch and lift their scrotum, or insert a finger into their anus. There are even some very rare cases in which men insert a solid object, such as a wire, into their urethra for stimulation. (It goes without saying that this latter practice is painful and potentially dangerous.) There are several types of mechanical and even electric male masturbation aids (vacuum pumps) on the market. These gadgets, which apply some rhythmic air suction to the penis, may have a certain therapeutic use for the physically handicapped or for men suffering from sexual dysfunctions. However, for healthy males they do not seem to offer any advantages over more "traditional" forms of masturbation.

“Sex aids”
In many countries today, various “sex shops” sell “sex toys” or “sex aids”, for example:
(Left) A vacuum pump made of transparent, hard material, designed to facilitate an erection.
(Right) A battery-driven vibrating sleeve, made of soft material as an aid to masturbation.