Wow, I never thought I would enjoy sticking something into my penis but dang it is good. I have no issue inserting these, I used the big gauge today was very scared but took my time, used lots of lube and made myself very wet before starting and my gosh it was fantastic!! I love these as they are flexible and easier to use then sounding rods. I boil these before using each time. As a beginner myself I would highly recommend trying these, if sounding is something you want to try. But please, please do lots of research, take your time and never force anything. Happy sounding!