That's silly. There is a difference in risk between sleeping with every crackwhore to come down the pyke, and sleeping with a steady girlfriend who you know well.
If you say you never really know them well enough, well that's true even if you marry them -- he could still get AIDS or STD's from his first sex after marriage.
There is no "risk free" option. There are only matters of degree. He's chosen a silly level.
Really? How do you figure? For every person you are sexually active with, you are actually sleeping with 10 or more other people?? For every one person you sleep with it increases exponentially. Each person they slept with before you, and each one that each of those slept with, and so on and on. So the risk is only with a drug user, or whor? I don't think so.... Think about how many people you have been sexually intimate with, and then figure they were the same with that number of people..... and then each of those that person slept with..... Kinda scary, eh? Then I ask myself about the risk, the emotional damage when the relationship breaks up, and everything else that goes with it. Abstinence til after marriage seems a very smart thing to do. (Fighting passion is hard, but considering the alternatives.... AIDS, STDs, emotional wreckage.... I'll take abstinence.)