My friend is in a dilemma, his has caught his 8 year boy googling the the words "beauty sex" , the child has grown in a very good environment and his parents are conservative, he even misspelt the word "beauty" as "beaty" because of his young age. He has two brothers and they have a very good behaviour He has some sort of ADHD which will make my friends job even more difficult to talk to him.
There is nothing worrying about an 8 year old being interested in what sex is. And in the kind of world an 8 year old lines in, searching for an explanation on the internet is something that probably just came to his mind when he wanted to know more. Unless there's other indications (like sexually aggressive behavior) there is nothing wrong with an 8 year old being interested in the topic.
Most children aged six to eight will: Look to peers, media, and other sources for information about sex
For comparison: at 8, I had already had basic sex education at school (in Germany). I knew anatomical terms, knew roughly what a period was (I am female, but all of this was taught to all students), knew sex was what causes pregnancy, the basics of pregnancy, and had seen schematic drawings of sex, including an erect penis.
The best thing your friend can do is talk to his son about sex in an age-appropriate way, answer his questions as best as she can (or find someone else to talk to him - maybe the other parent, if one is in his life), but also tell him that the internet is not the best place to look for information for sex. It is way too easy to accidentally be exposed to something she wouldn't want him exposed to like that. This is a nice article about sex education for school aged children, but there's a lot more websites and books out there. This is a short article about what knowledge is often taught to children at what age
I would say that yes, you do have a very good concern. His googling "sex" will only escalate to other things- pornography (which will be seen if googling sex). Pornography is actually clinically addictive, and as a male myself you have no idea how viewing- even a single time- really affects your whole thinking process. If I were you, I would get a great parental program. What I have on my computer (and it free, no I'm not soliciting) is k9 blue coat. it's free, and works great. I strongly recommend this for your older sons too.