All these are result of not taking proper precautions, IE using a condom. I could list all the different STIs you can get from unprotected love if you wanted.
This, and any physical damage risk mentioned is solved by "don't ram giant things up your butt without lube"
Is also worth mentioning there are other forms on m/m intercourse
Also a lot of people forget and f/f when discussing homo love
Yes, feces magically creates STI's, damn how could we have forgotten!
Ever heard of an enema..?
Enemas don't get rid of much other than the "ew, poop" factor
It's still dirty