Macbook Pro 13" Retina 2015 GETS REALLY HOT?

So I recently bought a macbook pro for my graphics course at uni. I went with the 13 inch version as I am travelling to uni each time so decided it needed to be portable. The screen wasn't really a issue as I can connect it up to a bigger monitor. But holy crap does it get hot. Even when I first used it I was only doing very basic things like browsing the web while listening to Spotify. Just basic stuff really, but even then it gets really warm, warmer than any other laptop I've ever had from doing basic stuff like this.

Fair enough I can understand it when I'm doing design work on photoshop or rendering something, I can see how it can get quite hot. But I really am confused as to why it gets quite hot from not doing much sometimes? It still gets warm from watching some videos on

I usually use it at a desk so it should get plenty of air flow, I have used it on my lap or bed a few times but it started getting really warm so I put it back on the desk.

Any help is appreciated :/

Cheers.

(However as I'm writing this it is pretty cool.. for once).