ok, to keep on topic, That bloke,lol , he could have explained it a bit better,but anyway. Now listen,during sex, you kiss alot(mixing saliva), sweat alot( on each other) and have alot of sexual juices flowing(mainly from a wet vagina or other),then Isn't it possible to contract them from the saliva and sweat?,(if the other person has any, of course), and if you have a cut or sore,(open wound) on genitals area(mainly), then your more likely to contract something, look,if you are really worried,then don't have sex,because really,you get your partners juices everywhere,even if you tried not to, but that's life, But!, Condoms do stop alot of unwanted pregnancy's(if you change it strait after).
But no,Condoms wont stop you from getting Aids, it may decrease the chances,but not stop it,...... in my opinion, if your gonna get it, you'll get it!,,,,only solution is a doll,device or something,,but that's a different debate,lol.
You could always try this,,,,,It is proven that sperm is the best skin softner, lolz