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. Other forms of anal sex include fingering, the use of sex toys for anal penetration, oral sex performed on the anus (), . An estimated 90% of men who have sex with men and as many as 5% to 10% of sexually active women engage in receptive anal intercourse.. Often referred to simply as anal sex, anal intercourse is sexual activity that involves inserting the penis into the anus. Oct 11, · Last week, I tried to figure out why more women are having anal sex and why it correlates so highly with orgasms. Since , the percentage of women aged who say they've tried anal sex has doubled to 40 percent. The percentage of women aged who say they've done it in the past year has.