Safer Dicksuckin' from: http://www.blowbuddies.com/safer-suck.html

• Condoms are your best bet. (OralMarin does not use for oral sex, but he does follow the rest of these suggestions below.)
• Don't take cum in your mouth. If you choose not to use a rubber when yer fuckin' face, it's better not to cum in your buddy's mouth or take cum (semen) in your mouth. The possibility of HIV infection or re-infection is nil when there is no exchange of body fluids. There are a few documented cases of HIV infection from oral sex. In these cases, the guys doin' the suckin' were getting cum in their mouths. It is recommended that you let that jism fly through the air, instead!
• If you suck dick without using a rubber, don't brush or floss your teeth 4 - 8 hours before you latch on to a piece of meat. Don't suck cock without a rubber if you have had recent dental work or if you suspect you may have cuts, lesions or sores in your mouth or throat.
• Speaking of sores, anyone with an STD is at a greater risk of transmitting/receiving HIV. Remember, a lot of STDs show up as sores, some ooze body fluids and body fluids can contain HIV! Try to make sure you and your partner are STD free.
• Use hydrogen peroxide after swingin' on a piece of meat. Hydrogen peroxide will destroy HIV on contact. If you don't use a condom, it may be a good idea to use the mouthwash before you suck, too.
• Moderation is the key, buddy! Although dicksuckin' is a lower risk activity in itself, deep throatin' 7 fat honkers in one night is going to play havoc on your throat. The abrasion which may result will definitely make it easier to become infected or re-infected and makes dicksuckin' a lot more risky. All night suckin' can make a dick raw, too...watch those teeth, buddy!
• Shaving your dick and balls is great. Just remember, do it at least a day before you go out on the prowl. Nicks and small cuts could be a problem so it's better to make sure they have healed somewhat before you plow a hot mouth.
• Metal cockrings or straps with metal snaps could be a hassle if your lip gets banged and the skin breaks. They also can cause abrasion at the base of your dick. Try a leather strap with the snaps behind yer nuts. Feels good too, buddy!
• The use of "poppers" may be dangerous -- they bring blood closer to the surface of membranes which may undergo trauma during cocksuckin' or other man-to-man activities. This could be like inviting HIV right into your bloodstream! Poppers and Viagra are a deadly combo. Don't ever mix them.
• Use your mouth? Anybody who uses his mouth for anything sexual should know they are at risk of getting HEPATITIS. Say some dude sticks his finger up Rick's butt and Rick has hepatitis. Then the dude twists Joe's tit and Bill comes along and sucks Joe's tit. Then Bill sucks David's big ol' dick. And so do 3 other guys. Theoretically, those 3 guys and Bill can get hepatitis. Best bet is SEE YOUR DOC and get vaccinated. There are vaccines available for Hep A and B!
• Already HIV positive? You can get re-infected and getting re-infected can most certainly help degrade your immune system quicker. Stick around for awhile and be here for the cure!
• Drugs and alcohol are addictive, impair your judgment and are bad for your immune system.