The advantages are simple use and an appearance some people find erotic, but this is often outweighed by the inability to use a different dildo, the often weak, floppy nature of the dildo, the inability to adjust to a given person for a comfortable fit, and their relatively short lifespan.
Double penetration dildos are generally two dildos molded onto a common base, designed for simultaneous vaginal and anal penetration or simultaneous vaginal pegging strapon dildo and vaginal penetration, not to be confused with a man using a strap-on along with his penis for double penetration, which is discussed below.





The principal feature of any strap-on setup is the attachment—the dildo used to penetrate the other partner. A double dildo can be used with or without a harness, although most provide no means of using them with a harness. Some dildos modeled to be realistic penises contain very heavy vein textures on the surface, causing a similar effect.
While special ones meant for use with a harness do exist, a normal double dildo is straight, is rarely at a comfortable angle for intercourse, and jabs into the cervix of a woman using one. For many positions, such as doggy style , the curved tip should point downwards, as otherwise it points in the wrong direction for either g-spot or prostate stimulation.

Most dildos or vibrators can be cleaned with soap and water or a sex toy cleaner. Sex between women: Female, same-sex intercourse is one of the more common uses of strapons. Some harnesses and dildos are made of a single piece of molded latex, with the dildo permanently built into the front.
Strapon sex toys are for anyone who wants to penetrate their partner. Transgender people: Some transgender people use a strap-on to provide the function of a penis, for example an FTM , as he was not originally born with one. Pairing a well-made harness that's adjustable to fit securely with a dildo that's just the right size for vaginal or anal play, the Red Rider really can do no wrong in the bedroom.
Almost every position associated with sexual intercourse (or not, in the case of simultaneous penetration) can be performed with a strap-on. The advantage of this method is that dildos which fit are widely available and inexpensive, and even many dildos not meant for harness use will work in one of these harnesses, such as most dildos with testicles.

The average sized strap-on penis kit includes a 6 to 8 inch long probe that is between 1 ¼ - 2 inches wide. Another means of providing stimulation to the wearer is a vibrating egg, "clit blaster", vibrating gel pads or whiskers, or other device mounted on the inside of the strapon.
While a double dildo obviously would provide stimulation to the wearer as well, the standard straight dildo is very poorly suited for harness use. In ancient Greece , dildos were made of stone or padded leather, and some evidence shows aforementioned leather was used to make a harness as well, with olive oil used for anal penetration.