Double penetration is a sexual practice in which a woman is simultaneously penetrated vaginally and anal, mostly by two men, more rarely by instruments or women with strap-on dildos. The double penetration is a popular sex variant in pornography, but in reality is difficult to carry out, since all partners have to be very athletic. In the general erotic one speaks rather of a “sandwich”. Although this is the same practice, it is approached more calmly.