I've told this story here before, but it continues to be illustrative...

I was going through in-country training in Vietnam with the First Cav. On my right and on my left were young men with many of the same moral questions about killing (and being killed). Soon, very soon, they--kids--would head into the jungle with their M16s some never to return; others to return as different human beings. We were called to join with the chaplains of our respective faiths. Amid all this, the stern warning from our Catholic chaplain was--and this belongs in a bizzaro war novel-- "don't succumb to the moral evils of.....masturbation." True story.