How awkward should i feel (My brother and his GF PDA's)?

Ok so my brother hangs out in my room alot (only like a 12 x 12 ft room(tiny)) and some times he has his girlfriend over, and some times they start making out... Some times it will be just a kiss, but other times it gets to the point of "making out kissing" neck kissing, and (and almost )... while I am sitting within 2-3 feet of them. And they have a room they can go in, which they do go into, but i feel they are using my room as four play then only leave when they want to have . Personally if i had to rate from 1 out of 10 i would give it a 10 for awkwardness. Am I right to feel that awkward? or are they in the wrong? How would you feel?