Teenage guys are diry because they're going through adolessance, so their curiosity about girls rages. They start maturing as well as noticing the bodily features of females around them. Some might make a big deal, others won't. It truly depends on the guy.
Also, guys'll talk dirty with their freinds bout girls because that's their nature, they can't become " in to" a girl without thinking that she's good looking first. In fact, some guys'll plainly ignore a girl whom doesn't look good to him. It's not so much that they're dirty, it's just that they're not like girls, they're thinking of the physical instead of the emotional. Like guys don't dream about getting married to some girl because they're in love. No, instead, they think and talk about one of the only things that's natural at their age. Sex
Also, guys'll talk dirty with their freinds bout girls because that's their nature, they can't become " in to" a girl without thinking that she's good looking first. In fact, some guys'll plainly ignore a girl whom doesn't look good to him. It's not so much that they're dirty, it's just that they're not like girls, they're thinking of the physical instead of the emotional. Like guys don't dream about getting married to some girl because they're in love. No, instead, they think and talk about one of the only things that's natural at their age. Sex