I mean that simply relying on condoms takes away your learning curve in how to trust people - instead of learning how not to carelessly give in to your impulses and stop listening to your intuition/gut instinct, by catching benign STDs or whatever (chances are you are not going to catch HIV or anything serious, and if you did, then you obviously made a really bad decision in who you slept with, and you kinda deserve what you got), you're putting something on your dick/your fella's dick, that basically means you don't trust anyone.
Instead of using your brain to work out if someone is trustworthy, along with your instinct, you're not thinking at all - so you use protection.
An analogy for this would be if you took someone in off the street when they knocked on your door, asking for bread, and you immediately said "yes that's fine" before looking at them, "but only if you're alright with me holding a gun pointed at you the whole time". It's quite an extreme example, but then so is the decision to forego rational thinking, and not trusting your gut instinct.
If you only stopped to look at the person, and listened to what they had to say, you'd work out quite quickly by their demeanor if they fucked around a lot, and that should throw up red flags...which people don't listen to. If you don't listen to red flags, you deserve what you get, how else are you supposed to experience life, in not by trial and error? Otherwise you are just living through other people, and that's not truly living.
Where did you get that about only when married, Llama? That's quite off the mark from what I said...that's also a ridiculous fearfilled decision anyone makes, unless they're truly not that interested in sex.
When you rely on something external, like a condom, or a gun, or a locked door, or a government - you only have yourself to blame if something goes wrong, but you feel justified to blame someone else, whereas if you look into how to act, and who to trust, how not to get a girl pregnant without using buzzkills like condoms, then you will be just as well prepared for a good healthy living sex life, even if you did contract chlamydia or herpes along the way - it's all part of the learning curve what you recieve, because you've given out a certain amount of a certain kind of energy.
You will have more knowledge, your awareness will be heightened, whereas if you rely on condoms, you have no real awareness, just an excuse, and reliant on something external to yourself.