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Anal man penetration

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One pair of male rhesus monkeys reared in the laboratory with exclusive social access to each other during their second year of life were observed to display reciprocal mounting with anal penetration on several occasions. Their mounts were of comparable duration to those which have been observed in matching heterosexual pairs, by contrast with the brief mounts which are often observed in dominance interactions. The postures exhibited by the mounted male resembled those typical of females during heterosexual coitus, while the mounting male displayed the species-typical male copulatory position. Each male at times assumed either role.
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Ambisexual behavior with male-male anal penetration in male rhesus monkeys | SpringerLink

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 men 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. The anal and rectal tissues are delicate and do not provide lubrication like the vagina does , so they can easily tear and permit disease transmission, especially if a personal lubricant is not used.
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Relationships, like produce, milk and reality television stars, have a shelf life. Most couples find that after a few weeks, months, or years, the luster fades and the initial carnal fury that brought them together has dissipated. The moldy codgers who get past this sexual brick wall do so by developing an elaborate series of coping mechanisms. Infidelity is common in scenarios where one or both sexual partners become fed up with plain vanilla missionary. Sometimes, the couple just resigns themselves to erotic entropy, and embraces a sort of marital celibacy typified by the nightly ritual of 'reading magazines' or 'checking the scores on ESPN.
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