SLF
The anus is the doorway to a whole bunch of germs I'd rather not think about, and definitely would wish no one contact with. Surely it can't be healthy to have contact with such an area (yes, I KNOW we all have one!)
Well the mouth,vagina,and penis are also harbouring many nasty germs and sometimes diseases that are not necessarily noticable at all stages so if you want to be healthy stay away from all of it.Don't you think that would be even better than simply eliminating anal sex?