Diseases and such. Condoms aren’t just for preventing pregnancy, they are also used to prevent stds. Also so tho cum won’t get inside the partner, cum in the anus can cause an upset stomach :)
In addition to what they mentioned above, anal sex is not the most “hygienic” way of having sex because of all the things that come out “there”, so it’s better to use condom when doing so :) It’s prone not just to STDs but also common bacterial or fungal infections! So it’s safer to use one always!
why do they use condoms? I mean, men can't get pregnant unless they're female or and omega. so why condoms?