That's because they are men. You think they were being honest? We are dirty disgusting neanderthals that like to blur the truth by nature, gay or straight. If i'm telling one of my friends some story about contracting an STD, of course i'm not going to admit that it was a dirty shitty sweaty asshole in some run down bathhouse with everyone spun on meth. I'm going to say it was in a high class spa and the asses were the cleanest i've ever seen, everyone was super careful and they even squirted disinfectant on every asshole upon entry! I honestly have absolutely no clue how it could have happened!
You tell the truth about some shit like that and your friends are going to fucking harass you forever, you will never forget about it. Aint nobody ever going to admit to rimming some dirty stank ass to a friend.
Are there risks? Sure but with the amount of people that eat ass in this country, i'm sure the risks are quite slim as we don't have any major ass parasite outbreaks. Plus, when compared to the other risky shit we all do for pleasure or fun, how dangerous is it really? Even compared to something like driving, flying, eating sushi, eating rare meat, biking in the city, playing sports etc.. I would imagine that someone that plays basketball regularly is more at risk for injury(i could be wrong about that though).