Amal Tips

If you have tips about doing anal please comment. Try to be a little specific too like if you say use lots of lube, you could say apply a lot of lube on the butthole more than the penis.
Also is the guy at risk if you do anal and don't use a condom and niether of use have any STDs or anything like that, but could he be at risk for some kind of infection from bacteria in the butt?