Mutual masturbation has nothing to do with masturbation, it is non-penetrative sex. The word "masturbation" is only used as a euphemism, just because handjob and fingering are similar to the way a male or famale masturbates. Mutual masturbation is actually handjob and fingering, which of course is non-penetrative sex, not masturbation! Mutual masturbation is not about two people sitting opposite to each other and masturbating without touching one another, this is nonsense! If no contact exists, this is simple masturbation, no matter how close two persons are to each other. No contact = Masturbation. Contact = "Mutual masturbation" (euphemism for handjob and fingering) = Non-penetrative sex. I hope you understand the difference! If you still don't get it, here is a website that maybe explains it a little better: http://www.teensadvisor.com/teen-dating/mutual-masturbation.html