When I was 15, two 16 year old friends invited me to join them on an overnight stay at a sand pit in a river bed. We brought firewood and weiner roasting handles and the fixings. When settled down for the night, feeling securely alone for the night, we got into our individual sleeping bags and talked a lot. When morning came, we were all aroused and wanted to jack off. We started doing it one at a time in front of each other. They were experienced enough to conclude that mutual masturbation evolved one toward homosexuality. I had no such notion and they refused my offer to help. I don't remember how many times we came there in the broad unsheltered daylight while rolling around in the clean sand.
I've since concluded that the sexual enhancement from being nude outdoors in a light warm breeze brings an enhancement of skin absorption of additional oxygen. This also explains why dogs naturally enjoy having their heads out the window with their mouths wide open in an auto. Their mouth becomes like a funnel forcing extra (compressed) air into their tiny lungs. They are getting an oxygen high! Lungs do only 50-80% of the possible job by themselves!
I am uncut and don't understand the 'rubbing' terminology in your stories. The skin rolls back and forth without a need for a rubbing. In a few of the porn photos, I've seen foreskin tight enough for only a rub, but this is rarely that tight in about 80% of cut males