It was revealed last weekend that McDermott (Ryan Malloy) had spent a night with a 16-year-old fan, just weeks after the birth of his daughter. Reports have since claimed that he has moved out of his martial home.
However, Lamb - best known as Archie Mitchell in the Albert Square drama - told The Sun that the character can "take over" the actor.
"What a silly boy! It is so dangerous, all that," he said. "They hire you because you are like the person they figure is the character, but then the character can take over.
"If you're playing a young guy who's a Jack-the-lad with the girls, where does it stop? It's very difficult for the young fellas."
He continued: "Without any shadow of a doubt I was better equipped to deal with it. It's difficult to prepare people. There are all these guys reading it about themselves that they're heart-throbs and it's a very confusing time for them.
"I've been knocking around for more years than most of them have been alive and have read all that blah about being a sex symbol. But at the end it disappears and you're not a sex symbol."
The Gavin & Stacey star admitted that it is "very difficult" to prepare actors for the level of recognition that comes with appearing in a UK soap.
"It's an interesting question. Should there be people who actually counsel people about that? There is no-one to do it," he said. "In a funny way I would like young people to read my book Mummy's Boy. I've written a lot about my discoveries of being an actor. It ain't all fun. If nothing else, the entertainment industry should come with a massive health warning."