I love it. Very hot to self pleasure with others doing the same. Seeing their technique and what makes them feel good.
I usually do that with my male friends. We sit and watch each other. I did have girl friends where we did it together. My wife and I sometimes do.
I can remember I had a girlfriend some years ago ... we were only together for 2-3 weeks. We actually did not have sex, but she loved it watching me stroking slowly. While she watched me she also went into beeing to herself. And she asked me to not cum as soon as I can. I can remember we had a session which easily took about 1 hour. And she asked me to cum on her face every time when I reached the point of no return. She was actually a strange woman ...
Recently as a test of will power my buddy and I jerked off in front of each other. Not easy to just lean forward and suck his cock. Afterwards he let me, knowing it wasn't easy to wait.
Absolutely love it. It usually me masturbating for her pleasure until she can not take it anymore.......OMG