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I can understand to some extent OP. I was staying for a few days with my brother when middle nephew borrowed my laptop, he was 12/13. it was in my bag in the room I was sleeping in. It didn't have a password.
When I next opened it up, I had various "ads" which showed me something was up as no I didn't want a hookup. The history showed about 3 hours of gay porn.
The main family computers were all in the living area so could understand why not those. Brother (not his bio dad) had 2 work laptops each related to his daytime job and weekend hobby job so he didn't go for those as would be easily found out.
I took him away from the house alone in the car and talked to him.
It all came tumbling out.
Turned out he had felt that he might be gay. His friends kept calling him gay and that he was bumming his close pal, this had become a rumour and friends of friends called him "Bummer".
He couldn't search on family computers and so when he saw a chance to actually find out what happens sexually between 2 gay men he took a chance and that was via my laptop.
Also knowing that I would probably approach him about it and give him a chance to talk it out, I'm very open-minded and trained years before as a peer sex ed advisor so was probably a good one all around. His mum would have gone ballistic straight off the mark.
It was devastating to him and his head was all over the place as he didn't have a mobile with a data package (he had a brick as lost so many) and poor signal where he lived.
While I drove, another bombshell dropped, he was also using drugs and explained why as they made him aggressive in some ways and horny in others.
It helped him to defend himself which he hadn't revealed why the aggression which had lead to detentions and finally being excluded from school for several days on 2 occasions in the previous 6 months.
Add puberty into the mix as well and I had one very mixed up kid.
In his case, it was he actually wanted to see what sex involved with 2 men and the videos he watched actually made him feel far worse. He had no interest what he really wanted was what I would now term as a "bromance" - close non-sexual male friend
He fully accepted that's his opinion and that 2 gay men are free to have sex whatever way they want with consent from both of them.
He said he was about to switch over to see how men and women had sex become I came back into the room and he had to replace laptop asap.
He had the basic gist from a biology point of view but had a million questions and couldn't ask google or internet due to above reasons.
So literally we had an AMA and I gave him suitable resources and info to go along with it.
We also discussed at length his now revealed drug problem and he had been buying anabolic steroids which explained how he was gaining a bit of muscle which was generally put down to all the weights and stuff he was constantly doing (to counter the need to go,go, go) , the severe acne (which can also be put down to being a teenager) and other effects.
I pointed out to his horror that the high doses he was taking could actually shrink his testicles and that scared him.
We were out for about 6/8 hours in total and stopped off for food, this whole conversation explained an awful lot, he was querying his sexuality ID, he was being bullied over "being gay", he wasnt getting reliable info as knew the internet didnt always tell you everything and thought watching it happen would help him understand and didnt feel he had anyone to talk to on a daily basis, he had been excluded from school, he had a million questions about sex and an active drug problem most of the symptoms and signs which were put down to puberty.
After all this and he was cried out, we made our plan. I would talk to his bio dad, his mum and my brother who was like a dad to him.
We would make an appointment with the GP and asked who he wanted to go with him so I ended up going and explaining the situation to GP. He got checked over physically and then the mental processes started, he was fed up with the way it all made him feel.
The GP in the interim of getting other professionals in as he wanted to just stop the steroids started him on a slow reduction plan and wanted to start the plan while he really wanted to do it rather than wait.
All 5 of us (4 adults and him) had a meeting with school and got them on board. It explained a lot for them too and they were unaware of bullying but it was nipped in the bud with a full school reminders re bullying and the consquences for those caught and support for others who may be and vigilence by all esp by staff.
He was "off sick" for a couple of weeks while he started withdrawal so by the time he went back, it was in place. Slurs of any kind werent tolerated towards anyone.
All 4 of us as adults agreed to answer any questions as openly and honestly with him but not in front of each other or his younger siblings.
He is now grown up now and in a long term relationship with a woman who he has full respect for and treats her well. They have 3 children and one on way.
He credits that day as being a day that changed his life, it started with porn but by opening up dialogue and keeping it open, answering questions and showing respect and listening to him, we got to underlying problems and what was really going on
Not saying any of this is like your DS however keep the channels open and keep talking,
Porn is not real life. Explain it like that, they set up a scene, stop and start with cameras from all angles, the male is often injected to keep erect for the duration and there are a lot of different things and that women are not sex toys.
They have real emotions, feelings and have normal lives just like you and he does.
Things dont happen like in the films and they certainly dont happen like in porn.
Re consent which is not always obvious in porn I suggest you show him a clip from youtube
You are doing great OP - keeping channels open and yes there is a lot of stuff on pornhb which is iffy and Im far from a prude as well.
(I know this is long but it gives the background to it all)
Good luck