As far as I know, this does not happen. The anus is not a reproductive organ, so it does not respond as a reproductive organ would. Generally, gay men (as well as heterosexual couples who engage in anal intercourse) make use of lubricants in lieu of any kind of natural arousal.
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Name : Amanda, Gender : F, Sexual Orientation : Straight, Race : White/Caucasian, Religion : Buddhist, City : Dallas, State : TX, Country : United States, Education level : High School Diploma,