Anal sex or anal intercourse is generally the insertion and thrusting of the erect penis into a person's anus , or anus and rectum , for sexual pleasure. While anal sex is commonly associated with male homosexuality , research shows that not all gay males engage in anal sex and that it is not uncommon in heterosexual relationships. As with most forms of sexual activity, anal sex participants risk contracting sexually transmitted infections STIs. Anal sex is considered a high-risk sexual practice because of the vulnerability of the anus and rectum.
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Melissotarsus beccarii. Specimen Label. Existing literature on all known species of Melissotarsus reveals similar habits of relying on armoured scale insects Diaspididae for food within the confines of tunnels chewed in healthy wood. The ants' anomalous morphology head and legs represents extreme adaptations tunnelling through live wood and silk spinning for their obligate mutualism with diaspidids.
Dildos have fetishistic value as well, and some users wield them in other ways, running them over the skin during foreplay for example. If of appropriate sizes, they can be used as gags, for oral penetration for a sort of artificial fellatio. Some people also use specially designed dildos to stimulate the G-spot. 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.