In some countries anal sex is reported as being a widely practiced, if still minority, form of intercourse between men and women.
One reason is that there is very low risk of unwanted pregnancy via unprotected anal intercourse. Also, anal sex is sometimes seen as preserving female virginity because it leaves the hymen intact.
Another reason is that the anus is considered to yield more tactile pleasure for the penis, being tighter than the vagina.
Though more often applied to first penetration, the concept of virginity is sometimes conceived as resting solely on vaginal penetration. In other cases, first anal intercourse is conceived of as ending a separate virginity from first vaginal intercourse, with varying degrees of seriousness. Determining the proportion of people that engage in anal sex, and the frequency with which they do so, is rather difficult. Sexual surveys tend to reflect whether those surveyed have ever had anal sex, or whether they have had anal sex in the last year, instead of distinguishing between those who have tried it one or a few times and those who regularly have anal sex.