This is not just about your teenage years, it’s any time that you were a minor.
In my upbringing and in my parents’ household, especially due to the times back then, it was unspoken yet truly understood that there wouldn’t be any such shenanigans nor any type of that nonsense going on, so don’t even entertain the thought. Heck, I was always the nerdy bookworm geek kid anyway, so I wasn’t really attracting anyone’s attention anyway.
When I was between 8 and 13 years old (I can’t remember exactly when this happened), my younger brother “stole” two separate “girlfriends” from me on two separate occasions, and for more than a decade or two, it really bugged me.
Caveat: they were two of the many girls whom I liked a whole lot, I had crushes on, I thought were very pretty, and had mutual feelings from them both before my brother happened along, but they were not truly girlfriends in the sense that we were going out or ever did anything together. It was more of an “announcement” type thing in the classroom as to who was paired with whom, so keep your grubby paws off! Obviously, my brother was oblivious to the social parameters. Grrrrrrr. 
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Which side or sides of the issue did each of them take?
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Was there ever any mention of the subject prior to your teen years, such as “You’re too young to be _____________________.”?
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Not really. My dad made a couple of statements about it when I was thirteen or fourteen and that was it.
His first statement about boys was that there’s no “just friends”. The two choices are yes and no, not “Let’s just be friends.” or “I like you as a brother.”.
The other statement he made about sex was that with boys, there are only two choices. I could either be marriage material or I could be pump and dump, but I couldn’t be both and I couldn’t be pump and dump now and marriage material later. He said the choice was mine.
So yeah, those are basically the only talks my dad had with me about sex and boys. Mom never mentioned anything about it.
I like the tomcat remark, lol! 
(It seems as if your father sided with your brother a lot, right?)
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This reminds me of something that happened when I was growing up.
My elder sister is about 3 1/2 years my senior, and she had a Barbie doll. I had a G.I. Joe. I’m trying to remember the Barbie doll and whether or not she was Caucasian or Black, but I don’t remember at all. Knowing my mother and my family, however, I am sure she was Black. I do know that my G.I. Joe was not only the Black dude, but that he had that fuzzy beard and the short Afro. I’ve thought he was the coolest thing in the world! Back in those days, the G.I. Joe was a full-size action figure, not reduced to the four or five inches that he is today. Suffice it to say that her Barbie and my G.I. Joe were approximately the same height.
One day when my sister wasn’t home, I went and got her Barbie, my G.I. Joe, took all their clothes off, and rubber banded them together in an awkward, stiff-armed embrace, complete with their expressionless faces, straight legs and smooth pelvises. When my sister got home and saw them, she exploded. She rescued her Barbie doll and took her away to be properly dressed once again.
I can’t remember how old I was at the time, but I do know that I was much too young to know anything about sex. Of course, watching movies and television shows, I had an idea about hugging and kissing and intimacy and things like that, but I didn’t really know the ramifications of what these two naked figures really meant. My sister probably did. She didn’t rat me out, but she certainly made sure that I never had access to her Barbie again.
I haven’t thought about this story in decades! For a moment here, I was considering bringing it up to my sister to see if she remembers, but fast forward to current times, she is an extremely devout religious person who rejects as much of secular life as she can. I don’t think it would be a good idea for me to bring this up to her.
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SavvyAnsley 