Not so much because of the penetration, unless it's a really physically demanding position. But the extra intimate bits such as kissing and petting are what shortens my breath. I also like to totally let go during the moments of orgasm and vocally express what I'm feeling, as well as physically. I feel like this is important, not only to show your partner how into it and them you are, but women tend to like seeing men like that as we aren't really socially allowed to show such openess and vulnerability.