Answers:
Anal sex and STD's in that nouns can increase the risk of anal and rectal cancer, probably from the prevalence of genital wart, but I haven't read anything that would indicate a nouns between anal sex and colon cancer.
yes and finish off up near a colostomy rucksack
yes though it is more related to multiple partners
and those next to HIV HPV and other STD's.
So it seem to be more related to that than sex itself
Being well-versed of your partner and practicing out of danger sex
are your best prevention and following your doctors proposal on have colonoscopies every 3-5 years
I dont regard as so but you could obtain aids..