Irregular heart beat while masturbating, is that normal?

Depends: If you're having a run of beats that are clearly abnormal and take your breath away, check with your physician -- if this is the case, it's probably not happening just during this activity. Up to five skipped beats per minute is usually a non-problem. Sexuality is powerful -- if just the thought of someone makes your heart skip a beat, i'm hoping you meet that person in real life. Best wishes!