Q: Can you accidentally infect with inappropriate images?

If all you did was look then you are probably infection free

As Csound says. It's highly unlikely you downloaded any malware, you'd have to authenticate to allow it in. Especially, since you closed the windows before they could open. I'd just go on as if nothing occurred, because that's what happened - nothing.

You can do a scan for known malware (and adware) with https://www.malwarebytes.com/antimalware/mac/

If you get a virus the paparazzi will be swarming around your house to announce it to the world, because you will be the first person to get a virus on a Mac.

A Mac can pick up malware but not if you just use common sense. You really have to actively invite some malware in for it to happen. That means downloading and knowingly giving your password for it to download. Mac provides all the protection you need with SIP (System Integrity Protection).I About System Integrity Protection on your Mac - Apple Support

If you do happen to download malware you can use MalwareBytes to get rid of it. If you use torrents, don't. Torrents are a good way to pick up malware because anything can hitchhike in on a download.

Safari pop-ups are different and easier to deal with. In Safari 9.1 and later just close the window. For earlier versions force quit and hold the shift key while restarting Safari.

https://support.apple.com/en-us/HT203987

Finally, stay away from programs that purport to "clean your Mac". They can do damage to your system. Your Mac needs no cleaning in the first place. All the cleaning that is necessary is taken care routinely by OS X.

If you get a virus the paparazzi will be swarming around your house to announce it to the world, because you will be the first person to get a virus on a Mac.

mj, why do you keep insisting on pointing out the difference between virus and malware whenever anyone says "virus," when you know full well that 99.999999% of those who employ the term "virus" mean that as a catch-all for any kind of malware/infection, and could care less about there being no viruses (at least in the wild) for OS X? This is pure pedantry. Why not just get straight to the point and talk about malware?

Haven't you already read this from Thomas? It's a little old by now, but still mostly relevant.

In addition to this, while there are currently no known drive-by infections (aka "self-installing") lurking in the wild, that doesn't have to mean that one won't suddenly appear. And I'm not so certain that such an infection won't be able to bypass the protections via archecture in 10.11, which you say are adequate.

Because and despite Thomas there is a difference, users lack of knowledge got them in trouble to begin with, no need to prolong that.

Csound1 wrote:

 

Because and despite Thomas there is a difference, users lack of knowledge got them in trouble to begin with, no need to prolong that.

So then tell me, please, how (and especially without even explaining what a virus is to the "uneducated") how does knowing that there are no viruses in the wild for OS X offer the slightest bit of protection against getting into trouble?

It can save them the waste of time & money & false sense of security that is Anti Virus software, and the truth matters, there are enough myths already.

Csound1 wrote:

 

It can save them the waste of time money that is Anti Virus software, and the truth matters, there are enough myths already.

Oh please, you are grasping for straws, this current discussion has nothing to do with A-V software. I could, but won't get off on that track. That's for another discussion. Will not go further playing your usual face saving, ego-serving ping-pong. Waste of time.

Suit yourself.

WZZZ wrote:

 

So then tell me, please, how (and especially without even explaining what a virus is to the "uneducated") how does knowing that there are no viruses in the wild for OS X offer the slightest bit of protection against getting into trouble?

For one, they won't be fooled by pop-ups saying they have a virus and to call a number to remove it.

For another, when their AV software tells them there is a virus.

For another, not being fooled by anti-virus developers pitching their particular brand of poison.

You're wasting your time and effort.

macjack wrote:

 

WZZZ wrote:

 

So then tell me, please, how (and especially without even explaining what a virus is to the "uneducated") how does knowing that there are no viruses in the wild for OS X offer the slightest bit of protection against getting into trouble?

For one, they won't be fooled by pop-ups saying they have a virus and to call a number to remove it.

For another, when their AV software tells them there is a virus.

For another, not being fooled by anti-virus developers pitching their particular brand of poison.

So if that's your intention (retroactively it seems), then why not at least include those points in your usual boilerplate? Simply telling them  that there are no viruses that can infect a Mac will not help them in the slightest when they come across one of those scam popups, since for them virus=malware. You need to tell them that those are scams, whether or not they employ the term "virus." What do they do if they get a scam pop-up saying your computer is infected with the Wirelurker Trojan?

And not all A-V (unfortunate label) is "poisonous." (We've already had that very tiresome discussion, so won't continue now.)