My advice is the opposite - you guys need to step up (well - down) and start eating more ass. Don't let the fear mongers take the fun out of sex and foreplay. Everything people do in that realm could possibly cause illness or might be dangerous - from STDs to causing ruptures in the skin - but that shouldn't prevent people from having a good time. If people are clean and healthy and showering regularly, there's no reason to fear anal stuff at all.