BARE NAKED SELF PIC

More of a confession than a dare but still:

I have a friend called Paul who has masturbated in front of me while I gave him a show of my naked body and found it extremely arousing. In fact so arousing that when I got home I masturbated myself.

How common is it for two people who know each other to do this for a period of time with no touching each other, just as a 'sex thing'I wonder?

Josee