My brother is asking weird. Please please please answer!?

My Mom had the twins at the doctor for chicken pox and my dad was in Milan. So it was just me and my 17 year old brother Lennon. It was so hot in the lounge (fire lighting) even though the door Into the hall (it's huge, it's so cold out there too!). In the end he just stripped off into his boxers. In front of me. And he has recently started coming down to breakfast in his underwear too. He usually wears a shirt and shorts. He was out of sports for 1 1/2 years after damaging the discs in his back or is ot the plates in his backs... I forget. Anyeays but he's recently been given the all clear for sports and has become really active. And he also lost his virginty a few months back. Is it just because he's more comfortable in his body? Is it a phase? Oh and last week he called me in to show him how to use the 'waxy thingys' so he could wax his chest! He's acting a bit odd lately. That's not the lennon I know. P.s the chest waxing thing didn' work out so me and his Gf had to help. He is such a r****d! Sorry