A dildo (or dildoe, a rare alternate spelling) is a sex toy, often explicitly phallic in appearance, intended for bodily interaction during masturbation or sexual intercourse. It has been reported that the per capita ownership of dildos has increased from 0.6 in 1972 to 3.1 in 2004, attributed mainly to the sexual repression over the last few decades coupled with the use of cheaper rubber materials and cost reductions due to economies of scale.
The word may derive from the words "Dil Doul", literally meaning an erect penis. The phrase is used in an old song named "The Maids Complaint for want of a Dil Doul". The song was among many in the Library of Samuel Pepys.
Later, PVC dildos with a softer PVC filler became popular. Most of the inexpensive dildos sold today are made this way.
PVC and jelly-rubber toys have often been found to be problematic because they contain unsafe phthalates, softeners added to many plastics that are also found in some jewelry, food containers, and other soft rubber toys. Phthalates have been linked to health problems such as cancer and prenatal defects. Products made of PVC or jelly rubber cannot be sterilized. Manufacturers recommend using condoms with these toys if users share them.
In the 1990s, silicone rubber dildos became more popular, a trend that has continued as the price has come down. These are easier to keep clean and do not have the characteristic plasticy aroma of PVC. They were expensive when introduced but are now reasonably priced, making them an excellent choice for the first-time user. Silicone holds body heat well, and is an excellent conductor of vibrations, allowing users to hold a vibrator at one end. Silicone is also a high-quality material (especially when compared to the cheap, unsafe jelly rubber that many other dildos are made of) that can be sterilized by boiling or bleaching.
High-end, chrome-plated steel dildos are currently manufactured. Users might prefer steel as a material because of its firmness, durability, and very low friction, especially when used in conjunction with lubricant. Because they are heavy, they can be used to exercise vaginal PC muscles. (Betty Dodson's "barbell" is an example.) A steel dildo may be warmed slightly or cooled in a bath of water before use to elicit a range of temperature sensations. It may also retain body heat of the user. Because of its polished, poreless surface, it may be sterilized with ease in boiling water, or even autoclaved.
Glass dildos have similar features to steel ones. Glass toys are solid, not hollow, and usually made of aeronautical-quality Pyrex or borosilicate, although this may vary depending on manufacturer. Like steel, glass toys may be used to apply firmer pressure than silicone can to a female's G-spot (urethral sponge) or male's prostate gland.
Cyberskin is a synthetic material made to look and feel like human skin. Many feel that Cyberskin does feel quite realistic. It is a porous material and cannot be sterilized. It often gets sticky after washing (which can be remedied by a dusting of cornstarch) and is much more delicate and prone to rips and tears than silicone dildos. "Packing dildos", which are not designed for penetration, are often made of this material. See Mr. Softie.
Dildos are used by people of all genders and sexual orientations, alone or with others, though some groups use dildos less than others. For example dildo use is more common among lesbians than straight men.
Dildos can transmit disease between users in the same way as other forms of sexual contact, and should not be shared among users where this is a concern. This is particularly true for dildos made of porous or micro-porous materials, such as most soft synthetics. On the other hand, smooth stainless steel or Pyrex dildos are easier to clean, non-porous, and can be more easily sanitized, either chemically or by boiling. Silicone dildos can also be sterilized via boiling or washing with a diluted bleach solution (10 parts water: 1 part bleach), then rinsed well. This is not meant to say that any unprotected dildo should be used by more than one person without being sanitized. An effective remedy is to use a fresh condom on the dildo.
Silicone dildos and silicone-based lubricants are not compatible, so users should avoid combining the two. Silicone lubricant dissolves the surface of silicone toys, turning it sticky. Pre-lubricated condoms almost always contain silicone lubricant, so when covering a silicone dildo with a condom, only a nonlubricated condom should be used. Non-silicone, water-based lubricants work best for silicone toys.
Dildos without a flanged base or other mechanism to control the depth of insertion should not be used anally, because they can be difficult to retrieve without medical assistance.
A dildo to be inserted in the anus and remain in place for a period of time is called a butt-plug. Dildos used for repeated anal penetration, such as thrusting, are usually referred to as simply "dildos" and must have a flared base to be safe for anal play. There are also double-ended dildos, with different-sized shafts pointing in the same direction, used by women to accomplish both anal and vaginal penetration at once, or for two partners to share a single dildo.
The double-ended dildo is used by some users during sexual acts. The dildo acts as a sort of "see-saw"; each partner takes an end and receives stimulation.
There are dildos designed to be worn in a harness, sometimes called a strap-on harness or strap-on dildo, or to be worn inside, sometimes with vibrating devices attached externally.
Strap-on dildos may be double-ended, in which case they are meant to be worn by users who want to experience vaginal or anal penetration while also penetrating a partner. They may also be used for anal penetration of men. In the latter case the act is known as pegging.
Other types of dildos include those designed to be fitted to the face of one party, inflatable dildos, and dildos with suction cups attached to the base (sometimes referred to as a wall mount). Other types of harness mounts for dildos (besides strapping to the groin) include thigh mount face mount, or furniture mounting straps.
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