Of course not, but I'm not going to assume they did, and there was never one hint, suggestion or implication that THOSE two 14 years old had had sex. Berto's thoughts about her were always those of idealised "first love".

Berto's entire personality was built around the fact that he was a "golden boy" suddenly out of his depth. He was the only child, good looking, good at sports and from a family whose fortune was on a par with Richie Rich and Scrooge McDuck. He was rather spoiled and was used to succeeding at everything he turned his hand to, and assumed that women would be the same. Of course the running gag of his character was that the only people he impressed were people he wasn't interested in, and those he wanted to impress thought he was just a kid trying too hard.