hi swedish people can you please answer

First of all regards and greetings for you all,

Second i just want to ask somthing about your great sociaty no disrespect or whatever.

I was in exchange school in this boy parents house we are both 13 .

After he got to know me and use it me, he was somtimes going from the shower to the room without anything on him. In front off his parents and sister (17), i don't say he was 24/7 in the nude but like after a shower or swimming.

I asked him about it after all and he said that yes its normal for boys to go nude around the house tell certain age like 14-15 .
Is that right? Is most swedish allowed that

I'm not judge by the way thx u all