Logic in real life is different from what we see in porn videos. It's logical. In porn videos viewers want to see passion, sex, pleasure, not logic and rationality. If we take anal creampie as an example, in such porn videos everything seems to be logical and there is nothing out of the ordinary, isn't it? You can watch in porn videos how a couple has passionate sex in different positions and their fuck ends with juicy anal creampie. It's beautiful, it's worth watching and enjoying. So I advise you to switch off your head and enjoy!